的setText导致应用程序崩溃 [英] setText causing application to crash

查看:553
本文介绍了的setText导致应用程序崩溃的处理方法,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

我是新来的Andr​​oid的发展。我想不通这是为什么在仿真器崩溃,当我在我的Andr​​oid模拟器运行这个程序,它会打开然后快速关闭给我一个不幸的Hello World已停止的消息。

 公共类HelloAndroidActivity延伸活动{
                / **当第一次创建活动调用。 * /
                @覆盖
                公共无效的onCreate(捆绑savedInstanceState){
                    super.onCreate(savedInstanceState);
                    的setContentView(R.layout.main);
                    TextView的T =(的TextView)findViewById(R.id.textView1);
                    t.se​​tText(Secoknd要显示的文字!);                }
            }

XML文件:

 < LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
                机器人:layout_width =match_parent
                机器人:layout_height =FILL_PARENT
                机器人:方向=横向>                <的TextView
                    机器人:ID =@ + ID / textView1
                    机器人:layout_width =match_parent
                    机器人:layout_height =38dp
                    机器人:编辑=真
                    机器人:文字=TextView的/>            < / LinearLayout中>

LogCat中:

  20 10-20:07:48.784:D / AndroidRuntime(601):关闭VM
            10-20 20:07:48.784:W / dalvikvm(601):主题ID = 1:螺纹未捕获的异常(组= 0x409951f8)退出
            10-20 20:07:48.804:E / AndroidRuntime(601):致命异常:主要
            10-20 20:07:48.804:E / AndroidRuntime(601):了java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.helloandroid / com.example.helloandroid.HelloAndroidActivity}:显示java.lang.NullPointerException
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.app.ActivityThread.access $ 600(ActivityThread.java:122)
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1146)
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.os.Handler.dispatchMessage(Handler.java:99)
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.os.Looper.loop(Looper.java:137)
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.app.ActivityThread.main(ActivityThread.java:4340)
            10-20 20:07:48.804:E / AndroidRuntime(601):在java.lang.reflect.Method.invokeNative(本机方法)
            10-20 20:07:48.804:E / AndroidRuntime(601):在java.lang.reflect.Method.invoke(Method.java:511)
            10-20 20:07:48.804:E / AndroidRuntime(601):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:784)
            10-20 20:07:48.804:E / AndroidRuntime(601):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
            10-20 20:07:48.804:E / AndroidRuntime(601):在dalvik.system.NativeStart.main(本机方法)
            10-20 20:07:48.804:E / AndroidRuntime(601):致:显示java.lang.NullPointerException
            10-20 20:07:48.804:E / AndroidRuntime(601):在com.example.helloandroid.HelloAndroidActivity.onCreate(HelloAndroidActivity.java:16)
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.app.Activity.performCreate(Activity.java:4465)
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
            10-20 20:07:48.804:E / AndroidRuntime(601):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
            10-20 20:07:48.804:E / AndroidRuntime(601):11 ...更多
            10-20 20:12:48.894:I /流程(601):发送信号。 PID:601 SIG:9


解决方案

如果TextView的是空与你提供的code,你必须设置错误布局ID。您code样品具有的setContentView(R.layout.main); 。有没有可能是你提供的XML是比其他main.xml中的文件?

I'm new to android development. I can't figure out why this is crashing in the emulator, When i run this program on my Android emulator it opens then quickly closes giving me a "Unfortunately hello world has stopped message.

            public class HelloAndroidActivity extends Activity {
                /** Called when the activity is first created. */
                @Override
                public void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    setContentView(R.layout.main);
                    TextView t=(TextView)findViewById(R.id.textView1);  
                    t.setText("Secoknd text to display!"); 

                }   
            }

xml file :

            <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="fill_parent"
                android:orientation="horizontal" >





                <TextView
                    android:id="@+id/textView1"
                    android:layout_width="match_parent"
                    android:layout_height="38dp"
                    android:editable="true"
                    android:text="TextView" />

            </LinearLayout>

LogCat:

            10-20 20:07:48.784: D/AndroidRuntime(601): Shutting down VM
            10-20 20:07:48.784: W/dalvikvm(601): threadid=1: thread exiting with uncaught exception (group=0x409951f8)
            10-20 20:07:48.804: E/AndroidRuntime(601): FATAL EXCEPTION: main
            10-20 20:07:48.804: E/AndroidRuntime(601): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.helloandroid/com.example.helloandroid.HelloAndroidActivity}: java.lang.NullPointerException
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.app.ActivityThread.access$600(ActivityThread.java:122)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.os.Handler.dispatchMessage(Handler.java:99)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.os.Looper.loop(Looper.java:137)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.app.ActivityThread.main(ActivityThread.java:4340)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at java.lang.reflect.Method.invokeNative(Native Method)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at java.lang.reflect.Method.invoke(Method.java:511)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at dalvik.system.NativeStart.main(Native Method)
            10-20 20:07:48.804: E/AndroidRuntime(601): Caused by: java.lang.NullPointerException
            10-20 20:07:48.804: E/AndroidRuntime(601):  at com.example.helloandroid.HelloAndroidActivity.onCreate(HelloAndroidActivity.java:16)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.app.Activity.performCreate(Activity.java:4465)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
            10-20 20:07:48.804: E/AndroidRuntime(601):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
            10-20 20:07:48.804: E/AndroidRuntime(601):  ... 11 more
            10-20 20:12:48.894: I/Process(601): Sending signal. PID: 601 SIG: 9

解决方案

If the TextView is null with the code you provided, you must be setting the wrong layout id. Your code sample has setContentView(R.layout.main);. Is it possible that the xml you provided is from a file other than main.xml?

这篇关于的setText导致应用程序崩溃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!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆