应用程序崩溃时pressing按钮 [英] Application crashes when pressing the button

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本文介绍了应用程序崩溃时pressing按钮的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我一直在努力寻找两天的解决方案,它拥有我发疯。我目前按照 http://developer.android.com/教程导/主题/ UI / actionbar.html#ActionItems

不幸的是,应用程序崩溃时SEND键是pressed(这是工作的罚款操作栏中实施前)

这里所涉及的文件:

1. AndroidManifest.xml中

 < XML版本=1.0编码=UTF-8&GT?;
<舱单的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    包=com.mycompany.myfirstapps>
    <使用-SDK安卓的minSdkVersion =7
    机器人:targetSdkVersion =18/>

    <应用
        机器人:allowBackup =真
        机器人:图标=@纹理映射/ ic_launcher
        机器人:标签=@字符串/ APP_NAME
        机器人:主题=@风格/ Theme.AppCompat.Light.DarkActionBar>

        &所述;! - 父活动 - >
        <活动
            机器人:MyActivityNAME =
            机器人:标签=@字符串/ APP_NAME>

            <意向滤光器>
                <作用机器人:名称=android.intent.action.MAIN/>
                <类机器人:名称=android.intent.category.LAUNCHER/>
            &所述; /意图滤光器>

        < /活性GT;

        <! - 第二个活动 - >
        <活动
            机器人:名称=。DisplayMessageActivity
            机器人:标签=@字符串/ title_activity_display_message
            机器人:parentActivityName =MyActivity。>
            &所述;元数据
                机器人:名称=android.support.PARENT_ACTIVITY
                MyActivity:机器人值= />
        < /活性GT;


    < /用途>

< /舱单>

 

<醇开始=2>

  • MyActivity.java
  •  包com.mycompany.myfirstapps;
    
    进口android.os.Bundle;
    进口android.support.v7.app.ActionBarActivity;
    进口android.support.v7.app.AppCompatActivity;
    进口android.view.Menu;
    进口android.view.MenuInflater;
    进口android.view.MenuItem;
    进口android.view.View;
    进口android.content.Intent;
    进口android.widget.EditText;
    
    
    公共类MyActivity扩展AppCompatActivity {
        公共最后静态字符串EXTRA_MESSAGE =com.mycompany.myfirstapps.MESSAGE;
    
        @覆盖
        保护无效的onCreate(包savedInstanceState){
            super.onCreate(savedInstanceState);
            的setContentView(R.layout.activity_main);
            getSupportActionBar()setDisplayHomeAsUpEnabled(真)。
    
            //如果你的minSdkVersion是11或更高,而使用:
            //getActionBar().setDisplayHomeAsUpEnabled(true);
        }
    
        @覆盖
        公共布尔onCreateOptionsMenu(功能菜单){
            //充气操作栏中使用的菜单项
            MenuInflater充气= getMenuInflater();
            inflater.inflate(R.menu.main_activity_actions,菜单);
            返回super.onCreateOptionsMenu(菜单);
        }
    
        @覆盖
        公共布尔onOptionsItemSelected(菜单项项){
            //操作栏上的项目手柄presses
            开关(item.getItemId()){
                案例R.id.action_search:
                    OpenSearch的();
                    返回true;
                案例R.id.action_settings:
                    openSettings();
                    返回true;
                默认:
                    返回super.onOptionsItemSelected(项目);
            }
        }
    
        //调用时,用户点击该按钮
        公共无效的sendMessage(查看视图){
            意向意图=新的意图(这一点,DisplayMessageActivity.class);
            EditText上EDITTEXT =(EditText上)findViewById(R.id.edit_message);
            字符串消息= editText.getText()的toString()。
            intent.putExtra(EXTRA_MESSAGE,消息);
            startActivity(意向);
        }
    
    
        私人无效的OpenSearch(){
         //做一点事
        }
    
    
        私人无效openSettings(){
    //做一点事
        }
    
    }
    
     

    <醇开始=3>

  • DisplayMessageActivity.java
  •  包com.mycompany.myfirstapps;
    
    进口android.content.Intent;
    进口android.os.Bundle;
    进口android.support.v7.app.AppCompatActivity;
    进口android.view.Menu;
    进口android.view.MenuItem;
    进口android.widget.TextView;
    
    
        公共类DisplayMessageActivity扩展AppCompatActivity {
    
        @覆盖
        保护无效的onCreate(包savedInstanceState){
            super.onCreate(savedInstanceState);
            意向意图= getIntent();
    
            //创建文本视图
            字符串消息= intent.getStringExtra(MyActivity.EXTRA_MESSAGE);
            TextView中的TextView =新的TextView(本);
            textview.setTextSize(40);
            textview.setText(消息);
    
            //设置文本视图作为活动布局
            的setContentView(TextView的);
        }
    
        @覆盖
        公共布尔onCreateOptionsMenu(功能菜单){
            //充气菜单;这增加了项目操作栏,如果它是present。
            。getMenuInflater()膨胀(R.menu.menu_display_message,菜单);
            返回true;
        }
    
        @覆盖
        公共布尔onOptionsItemSelected(菜单项项){
            //处理动作栏项目点击这里。将操作栏
            //自动在主/向上按钮操作的点击,只要
            //你在AndroidManifest.xml中指定一个父活动。
            INT的id = item.getItemId();
    
            // noinspection SimplifiableIfStatement
            如果(ID == R.id.action_settings){
                返回true;
            }
    
            返回super.onOptionsItemSelected(项目);
        }
    }
     

    <醇开始=4>

  • activity_main.xml
  •  &LT; LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns:工具=htt​​p://schemas.android.com/tool​​s
    机器人:layout_width =match_parent
    机器人:layout_height =match_parent
    机器人:方向=横向
    机器人:主题=@风格/ CustomActionBarTheme&GT;
    
    &LT;的EditText
        机器人:ID =@ + ID / edit_message
        机器人:layout_width =WRAP_CONTENT
        机器人:layout_height =WRAP_CONTENT
        机器人:提示=@字符串/ edit_message/&GT;
    
    &LT;按钮
        机器人:layout_width =WRAP_CONTENT
        机器人:layout_height =WRAP_CONTENT
        机器人:文本=@字符串/ button_send
        机器人:的onClick =的sendMessage/&GT;
    
    &LT; / LinearLayout中&GT;
     

  • build.gradle
  •  应用插件:com.android.application
    
    安卓{
        compileSdkVersion 22
        buildToolsVersion22.0.1
    
        defaultConfig {
            的applicationIDcom.mycompany.myfirstapps
            的minSdkVersion 8
            targetSdkVersion 22
            版本code 1
            VERSIONNAME1.0
        }
        buildTypes {
            推出 {
                minifyEnabled假
                proguardFiles getDefaultProguardFile('ProGuard的-android.txt'),'proguard-rules.pro
            }
        }
    }
    
    依赖{
        编译文件树(导演:库,包括:['的* .jar'])
        编译com.android.support:appcompat-v7:22.1.1
    }
    
     

    logcat的

      05-14 22:57:03.139 2514年至2562年/ android.process.acore I / ContactLocale:通讯录标签[EN-US]:[A,B,C,D ,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,Α,Β,Γ ,Δ,Ε,Ζ,Η,Θ,Ι,Κ,Λ,Μ,Ν,Ξ,Ο,Π,Ρ,Σ,Τ,Υ,Φ,Χ,Ψ,Ω,А,Б,В, Г,Д,Ђ,Е,Є,Ж,З,И,І,Ї,Й,Ј,К,Л,Љ,М,Н,Њ,О,П,Р,С,Т,Ћ,У, Ф,Х,Ц,Ч,Џ,Ш,Щ,Ю,Я,א,ב,ג,ד,ה,ו,ז,ח,ט,י,כ,ל,מ,נ,ס,ע ,פ,צ,ק,ר,ש,ת,ا,ب,ت,ث,ج,ح,خ,د,ذ,ر,ز,س,ش,ص,ض,ط,ظ,ع, غ,ف,ق,​​ك,ل,م,ن,ه,و,ي,ก,ข,ฃ,ค,ฅ,ฆ,ง,จ,ฉ,ช,ซ,ฌ,ญ,ฎ,ฏ ,ฐ,ฑ,ฒ,ณ,ด,ต,ถ,ท,ธ,น,บ,ป,ผ,ฝ,พ,ฟ,ภ,ม,ย,ร,ฤ,ล,ฦ,ว,ศ ,ษ,ส,ห,ฬ,อ,ฮ,ㄱ,ㄴ,ㄷ,ㄹ,ㅁ,ㅂ,ㅅ,ㅇ,ㅈ,ㅊ,ㅋ,ㅌ,ㅍ,ㅎ,あ,か,さ,た,な,は,ま,や,ら,わ,#]
    05-14 22:57:05.181 2514年至2532年/ android.process.acore V / BackupServiceBinder:DOBACKUP()调用
    05-14 22:57:05.508 2514年至2532年/ android.process.acore I /艺术:WaitForGcToComplete封锁267.334ms的原因DisableMovingGc
    05-14 22:57:05.619 2514年至2532年/ android.process.acore E / DictionaryBackupAgent:无法从游标中读取
    05-14 22:57:05.722 2514年至2562年/ android.process.acore I /艺术:WaitForGcToComplete封锁357.236ms的原因DisableMovingGc
    1月五日至15日:35:32.770 2514年至2525年/ android.process.acore W /艺术:暂停所有线程了:57.246ms
    1月五日至15日:35:35.813 2514年至2527年/ android.process.acore E / StrictMode:资源被收购,在连接的堆栈跟踪,但从来没有公布过。见java.io.Closeable有关避免资源泄漏的信息。
        java.lang.Throwable中:显式的终止方法关闭不叫
                在dalvik.system.CloseGuard.open(CloseGuard.java:184)
                在android.os.ParcelFileDescriptor&LT; INIT&GT;(ParcelFileDescriptor.java:180)
                在android.os.ParcelFileDescriptor $ 1.createFromParcel(ParcelFileDescriptor.java:916)
                在android.os.ParcelFileDescriptor $ 1.createFromParcel(ParcelFileDescriptor.java:906)
                在android.app.IBackupAgent $ Stub.onTransact(IBackupAgent.java:57)
                在android.os.Binder.execTransact(Binder.java:446)
    1月五日至15日:35:35.925 2514年至2527年/ android.process.acore E / StrictMode:资源被收购,在连接的堆栈跟踪,但从来没有公布过。见java.io.Closeable有关避免资源泄漏的信息。
        java.lang.Throwable中:显式的终止方法关闭不叫
                在dalvik.system.CloseGuard.open(CloseGuard.java:184)
                在android.os.ParcelFileDescriptor&LT; INIT&GT;(ParcelFileDescriptor.java:180)
                在android.os.ParcelFileDescriptor $ 1.createFromParcel(ParcelFileDescriptor.java:916)
                在android.os.ParcelFileDescriptor $ 1.createFromParcel(ParcelFileDescriptor.java:906)
                在android.app.IBackupAgent $ Stub.onTransact(IBackupAgent.java:64)
                在android.os.Binder.execTransact(Binder.java:446)
    1月五日至15日:35:36.578 2514年至2527年/ android.process.acore E / StrictMode:资源被收购,在连接的堆栈跟踪,但从来没有公布过。见java.io.Closeable有关避免资源泄漏的信息。
        java.lang.Throwable中:显式的终止方法关闭不叫
                在dalvik.system.CloseGuard.open(CloseGuard.java:184)
                在android.os.ParcelFileDescriptor&LT; INIT&GT;(ParcelFileDescriptor.java:180)
                在android.os.ParcelFileDescriptor $ 1.createFromParcel(ParcelFileDescriptor.java:916)
                在android.os.ParcelFileDescriptor $ 1.createFromParcel(ParcelFileDescriptor.java:906)
                在android.app.IBackupAgent $ Stub.onTransact(IBackupAgent.java:71)
                在android.os.Binder.execTransact(Binder.java:446)
    
     

    可能是什么问题?

    解决方案

    将您的EditText您的onCreate()方法里面MyActivity.java

      @覆盖
    保护无效的onCreate(包savedInstanceState){
        super.onCreate(savedInstanceState);
        的setContentView(R.layout.activity_main);
    
        EditText上EDITTEXT =(EditText上)findViewById(R.id.edit_message);
        getSupportActionBar()setDisplayHomeAsUpEnabled(真)。
    
    
        //如果你的minSdkVersion是11或更高,而使用:
        //getActionBar().setDisplayHomeAsUpEnabled(true);
    }
     

    和你的sendMessage()方法里面,就删除了这一行。

    编辑:好像你在新的AppCompatActivity延伸。尝试将其更改为ActionBarActivity在这两个活动。例如:

     公共类MyActivity扩展ActionBarActivity {...}
    公共类DisplayMessageActivity扩展ActionBarActivity {...}
     

    编辑:如果你计划在不使用ActionBarActivity,那么你需要定义一个自定义工具栏和initialze这样说。

     工具栏=(栏)findViewById(R.id.toolbar);
    setSupportActionBar(工具栏);
    getSupportActionBar()setDisplayHomeAsUpEnabled(真)。
     

    I have struggled to find the solution for couple of days and it has drive me nuts. I am currently following the tutorial in http://developer.android.com/guide/topics/ui/actionbar.html#ActionItems

    Unfortunately the application crashes when SEND button was pressed (It was working fine before the action bar was implemented)

    Here are the involved files:

    1. AndroidManifest.xml

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.mycompany.myfirstapps" >
        <uses-sdk android:minSdkVersion="7"
        android:targetSdkVersion="18" />
    
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/Theme.AppCompat.Light.DarkActionBar">
    
            <!-- parent activity-->
            <activity
                android:name=".MyActivity"
                android:label="@string/app_name">
    
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
    
            </activity>
    
            <!--second activity -->
            <activity
                android:name=".DisplayMessageActivity"
                android:label="@string/title_activity_display_message"
                android:parentActivityName=".MyActivity" >
                <meta-data
                    android:name="android.support.PARENT_ACTIVITY"
                    android:value=".MyActivity" />
            </activity>
    
    
        </application>
    
    </manifest>
    ​
    

    1. MyActivity.java

    package com.mycompany.myfirstapps;
    
    import android.os.Bundle;
    import android.support.v7.app.ActionBarActivity;
    import android.support.v7.app.AppCompatActivity;
    import android.view.Menu;
    import android.view.MenuInflater;
    import android.view.MenuItem;
    import android.view.View;
    import android.content.Intent;
    import android.widget.EditText;
    
    
    public class MyActivity extends AppCompatActivity {
        public final static String EXTRA_MESSAGE="com.mycompany.myfirstapps.MESSAGE";
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    
            // If your minSdkVersion is 11 or higher, instead use:
            //getActionBar().setDisplayHomeAsUpEnabled(true);
        }
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu items for use in the action bar
            MenuInflater inflater = getMenuInflater();
            inflater.inflate(R.menu.main_activity_actions, menu);
            return super.onCreateOptionsMenu(menu);
        }
    
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            // Handle presses on the action bar items
            switch (item.getItemId()) {
                case R.id.action_search:
                    openSearch();
                    return true;
                case R.id.action_settings:
                    openSettings();
                    return true;
                default:
                    return super.onOptionsItemSelected(item);
            }
        }
    
        //called when user click the button
        public void sendMessage(View view){
            Intent intent = new Intent(this,DisplayMessageActivity.class);
            EditText editText=(EditText)findViewById(R.id.edit_message);
            String message=editText.getText().toString();
            intent.putExtra(EXTRA_MESSAGE,message);
            startActivity(intent);
        }
    
    
        private void openSearch() {
         //do something
        }
    
    
        private void openSettings() {
    //do something
        }
    
    }
    ​
    

    1. DisplayMessageActivity.java

    package com.mycompany.myfirstapps;
    
    import android.content.Intent;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.widget.TextView;
    
    
        public class DisplayMessageActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            Intent intent= getIntent();
    
            //create the text view
            String message=intent.getStringExtra(MyActivity.EXTRA_MESSAGE);
            TextView textview= new TextView(this);
            textview.setTextSize(40);
            textview.setText(message);
    
            //set the text view as the activity layout
            setContentView(textview);
        }
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.menu_display_message, menu);
            return true;
        }
    
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            // Handle action bar item clicks here. The action bar will
            // automatically handle clicks on the Home/Up button, so long
            // as you specify a parent activity in AndroidManifest.xml.
            int id = item.getItemId();
    
            //noinspection SimplifiableIfStatement
            if (id == R.id.action_settings) {
                return true;
            }
    
            return super.onOptionsItemSelected(item);
        }
    }
    

    1. activity_main.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:theme="@style/CustomActionBarTheme">
    
    <EditText
        android:id="@+id/edit_message"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="@string/edit_message"/>
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_send"
        android:onClick="sendMessage"/>
    
    </LinearLayout>
    

    1. build.gradle

    apply plugin: 'com.android.application'
    
    android {
        compileSdkVersion 22
        buildToolsVersion "22.0.1"
    
        defaultConfig {
            applicationId "com.mycompany.myfirstapps"
            minSdkVersion 8
            targetSdkVersion 22
            versionCode 1
            versionName "1.0"
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            }
        }
    }
    
    dependencies {
        compile fileTree(dir: 'libs', include: ['*.jar'])
        compile 'com.android.support:appcompat-v7:22.1.1'
    }
    ​
    

    Logcat

    05-14 22:57:03.139    2514-2562/android.process.acore I/ContactLocale﹕ AddressBook Labels [en-US]: [, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, Α, Β, Γ, Δ, Ε, Ζ, Η, Θ, Ι, Κ, Λ, Μ, Ν, Ξ, Ο, Π, Ρ, Σ, Τ, Υ, Φ, Χ, Ψ, Ω, , А, Б, В, Г, Д, Ђ, Е, Є, Ж, З, И, І, Ї, Й, Ј, К, Л, Љ, М, Н, Њ, О, П, Р, С, Т, Ћ, У, Ф, Х, Ц, Ч, Џ, Ш, Щ, Ю, Я, , א, ב, ג, ד, ה, ו, ז, ח, ט, י, כ, ל, מ, נ, ס, ע, פ, צ, ק, ר, ש, ת, , ا, ب, ت, ث, ج, ح, خ, د, ذ, ر, ز, س, ش, ص, ض, ط, ظ, ع, غ, ف, ق, ك, ل, م, ن, ه, و, ي, , ก, ข, ฃ, ค, ฅ, ฆ, ง, จ, ฉ, ช, ซ, ฌ, ญ, ฎ, ฏ, ฐ, ฑ, ฒ, ณ, ด, ต, ถ, ท, ธ, น, บ, ป, ผ, ฝ, พ, ฟ, ภ, ม, ย, ร, ฤ, ล, ฦ, ว, ศ, ษ, ส, ห, ฬ, อ, ฮ, , ㄱ, ㄴ, ㄷ, ㄹ, ㅁ, ㅂ, ㅅ, ㅇ, ㅈ, ㅊ, ㅋ, ㅌ, ㅍ, ㅎ, , あ, か, さ, た, な, は, ま, や, ら, わ, #, ]
    05-14 22:57:05.181    2514-2532/android.process.acore V/BackupServiceBinder﹕ doBackup() invoked
    05-14 22:57:05.508    2514-2532/android.process.acore I/art﹕ WaitForGcToComplete blocked for 267.334ms for cause DisableMovingGc
    05-14 22:57:05.619    2514-2532/android.process.acore E/DictionaryBackupAgent﹕ Couldn't read from the cursor
    05-14 22:57:05.722    2514-2562/android.process.acore I/art﹕ WaitForGcToComplete blocked for 357.236ms for cause DisableMovingGc
    05-15 01:35:32.770    2514-2525/android.process.acore W/art﹕ Suspending all threads took: 57.246ms
    05-15 01:35:35.813    2514-2527/android.process.acore E/StrictMode﹕ A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
        java.lang.Throwable: Explicit termination method 'close' not called
                at dalvik.system.CloseGuard.open(CloseGuard.java:184)
                at android.os.ParcelFileDescriptor.<init>(ParcelFileDescriptor.java:180)
                at android.os.ParcelFileDescriptor$1.createFromParcel(ParcelFileDescriptor.java:916)
                at android.os.ParcelFileDescriptor$1.createFromParcel(ParcelFileDescriptor.java:906)
                at android.app.IBackupAgent$Stub.onTransact(IBackupAgent.java:57)
                at android.os.Binder.execTransact(Binder.java:446)
    05-15 01:35:35.925    2514-2527/android.process.acore E/StrictMode﹕ A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
        java.lang.Throwable: Explicit termination method 'close' not called
                at dalvik.system.CloseGuard.open(CloseGuard.java:184)
                at android.os.ParcelFileDescriptor.<init>(ParcelFileDescriptor.java:180)
                at android.os.ParcelFileDescriptor$1.createFromParcel(ParcelFileDescriptor.java:916)
                at android.os.ParcelFileDescriptor$1.createFromParcel(ParcelFileDescriptor.java:906)
                at android.app.IBackupAgent$Stub.onTransact(IBackupAgent.java:64)
                at android.os.Binder.execTransact(Binder.java:446)
    05-15 01:35:36.578    2514-2527/android.process.acore E/StrictMode﹕ A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
        java.lang.Throwable: Explicit termination method 'close' not called
                at dalvik.system.CloseGuard.open(CloseGuard.java:184)
                at android.os.ParcelFileDescriptor.<init>(ParcelFileDescriptor.java:180)
                at android.os.ParcelFileDescriptor$1.createFromParcel(ParcelFileDescriptor.java:916)
                at android.os.ParcelFileDescriptor$1.createFromParcel(ParcelFileDescriptor.java:906)
                at android.app.IBackupAgent$Stub.onTransact(IBackupAgent.java:71)
                at android.os.Binder.execTransact(Binder.java:446)
    ​
    

    What could be wrong?

    解决方案

    Move your EditText inside of your onCreate() method in MyActivity.java

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    
        EditText editText=(EditText)findViewById(R.id.edit_message);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    
    
        // If your minSdkVersion is 11 or higher, instead use:
        //getActionBar().setDisplayHomeAsUpEnabled(true);
    }
    

    And inside your sendMessage() method, just remove that line.

    Edit: It seems like you're extending from the new AppCompatActivity. Try changing it to ActionBarActivity in both the activities. For example:

    public class MyActivity extends ActionBarActivity {...}
    public class DisplayMessageActivity extends ActionBarActivity {...}
    

    Edit: If you're planning on not using the ActionBarActivity, then you need to define a custom Toolbar and initialze it like this..

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    

    这篇关于应用程序崩溃时pressing按钮的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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