应用程序崩溃当试图通过点击按钮来更改TextView的TEXTSIZE [英] App Crash When Trying to Change textsize in textView by clicking on button
问题描述
在我的一个活动,我有一个菜单选项文本选项当用户点击这个重定向到另一个布局,我养了两个按钮之一的加号按钮,另外一个就是减号按钮
当用户点击该按钮我要改变BackStack活动的TextView的文本大小
下面是我的code下面当我点击MenuOPtion这个应用程序崩溃,它报告的 NullPointerException异常在logcat中
我的详细活动
@覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.detail_activity); detailtext =(的TextView)findViewById(R.id.detail);
dbHelper =新SqlLiteDbHelper(本);
尝试{
dbHelper.openDataBase();
}赶上(的SQLException E){
e.printStackTrace();
} sqLiteDatabase = dbHelper.getReadableDatabase();
光标= dbHelper.getdetails(sqLiteDatabase,selectedData); 如果(cursor.moveToFirst())
{ detailtext.setText(cursor.getString(0));
}@覆盖
公共布尔onOptionsItemSelected(菜单项项){
INT ID = item.getItemId();
如果(ID == R.id.text_option)
{
意向意图=新意图(这一点,CustomSetting.class);
startActivity(意向); }
返回super.onOptionsItemSelected(项目);
}
Detail_menu.xml
<项目机器人:ID =@ + ID / text_option
机器人:orderInCategory =100
机器人:showAsAction =ifRoom
机器人:标题=文本选项
/>
CustomSetting.java
公共类CustomSetting扩展AppCompatActivity { DetailActivity detailActivity;
ImageButton的加,减,关闭;
INT txtSize = 14;
TextView的细节= detailActivity.detailtext;
@覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.custom_setting);
加上=(的ImageButton)findViewById(R.id.plus);
减去=(的ImageButton)findViewById(R.id.minus);
接近=(的ImageButton)findViewById(R.id.close);plus.setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
如果(detail.getTextSize()== 14 || detail.getTextSize()== 15 || detail.getTextSize()== 16 || detail.getTextSize()== 17){
txtSize ++;
detail.setTextSize(txtSize);
}否则如果(detail.getTextSize()== 18){
txtSize + = 0;
detail.setTextSize(txtSize);
}其他{
txtSize + = 0;
detail.setTextSize(txtSize);
} }
});
minus.setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
如果(detail.getTextSize()== 15 || detail.getTextSize()== 16 || detail.getTextSize()== 17 | detail.getTextSize()== 18){
txtSize--;
detail.setTextSize(txtSize);
}其他{
txtSize + = 0;
detail.setTextSize(txtSize);
} }
});
close.setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
意向意图=新意图(CustomSetting.this,DetailActivity.class);
startActivity(意向);
}
}); }
custom_setting.xml
<的ImageButton
机器人:layout_width =50dp
机器人:layout_height =40dp
机器人:背景=@绘制/关闭
机器人:layout_above =@ + ID / TextView的
机器人:layout_toRightOf =@ + ID /负
机器人:layout_toEndOf =@ + ID /负
机器人:ID =@ + ID /关闭
/>
<的ImageButton
机器人:layout_width =50dp
机器人:layout_height =40dp
机器人:背景=@绘制/ plusign
机器人:layout_marginTop =110dp
机器人:ID =@ + ID /加
机器人:layout_alignParentTop =真
机器人:layout_alignLeft =@ + ID / TextView的
机器人:layout_alignStart =@ + ID / TextView的/>
<的ImageButton
机器人:layout_width =50dp
机器人:layout_height =40dp
机器人:背景=@绘制/ minusign
机器人:ID =@ + ID /负
机器人:layout_alignTop =@ + ID /加
机器人:layout_alignRight =@ + ID / TextView的
机器人:layout_alignEnd =@ + ID / TextView的/> <的TextView
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:textAppearance =机器人:ATTR / textAppearanceLarge
机器人:文本=更改文字大小
机器人:ID =@ + ID / TextView的
机器人:layout_above =@ + ID /负
机器人:layout_centerHorizontal =真
机器人:文字颜色=#FFFFFF
/>
logcat的:
流程:com.example.aa.sidd,PID:23413
了java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.aa.sidd / com.example.aa.sidd.CustomSetting}:android.view.InflateException:二进制XML文件行#17:错误充气类<&不明GT ;
在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2436)
在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2498)
在android.app.ActivityThread.access $ 900(ActivityThread.java:179)
在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1324)
在android.os.Handler.dispatchMessage(Handler.java:102)
在android.os.Looper.loop(Looper.java:146)
在android.app.ActivityThread.main(ActivityThread.java:5641)
在java.lang.reflect.Method.invokeNative(本机方法)
在java.lang.reflect.Method.invoke(Method.java:515)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1288)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1104)
在dalvik.system.NativeStart.main(本机方法)
android.view.InflateException:引起二进制XML文件行#17:错误充气类<&不明GT;
在android.view.LayoutInflater.createView(LayoutInflater.java:626)
显示在DialogFragment的形式,新的布局。我们的想法是,以显示在一DialogFragment弹出的形式的增加/减少选项。你可以从弹出的增加/减少的大小。一旦弹出驳回选定的大小设置为TextView的在你的活动。
MainActivity.java
公共类MainActivity扩展AppCompatActivity {公共静态INT updatedSize;
TextView的greetingText;@覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
greetingText =(的TextView)findViewById(R.id.hello_world_text);
}@覆盖
公共布尔onCreateOptionsMenu(菜单菜单){
//充气菜单;如果是present这增加了项目操作栏。
。getMenuInflater()膨胀(R.menu.menu_main,菜单);
返回true;
}@覆盖
公共布尔onOptionsItemSelected(菜单项项){
INT ID = item.getItemId();
如果(ID == R.id.action_settings){
mycustomLayout();
返回true;
} 返回super.onOptionsItemSelected(项目);
}公共无效mycustomLayout(){
FragmentManager经理= getFragmentManager();
弹出式弹出=新弹出(新FragmentDismissHandler());
popUp.show(经理,弹出);}公共无效refreshText(){
如果(updatedSize大于0)
greetingText.setTextSize(updatedSize);
}私有类FragmentDismissHandler扩展了Handler {
@覆盖
公共无效的handleMessage(消息MSG){
super.handleMessage(MSG);
refreshText();
}
}}
PopUp.java(自定义布局DialogFragment)
公共类弹出式扩展DialogFragment实现View.OnClickListener {的ImageButton增加,减少,集;
TextView的sizeOfText;
静态INT大小;
处理程序处理程序;
公共弹出式(处理程序处理){
this.handler =处理程序;
}
公共弹出式(){}
@覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
//充气的布局该片段
getDialog()的setTitle(改变文字大小);
查看查看= inflater.inflate(R.layout.my_custom_layout,集装箱,FALSE); 增加=(的ImageButton)view.findViewById(R.id.inc);
increase.setOnClickListener(本); 减少=(的ImageButton)view.findViewById(R.id.dec);
decrease.setOnClickListener(本); sizeOfText =(TextView中)view.findViewById(R.id.size_text);
sizeOfText.setText(文本); 设置=(的ImageButton)view.findViewById(R.id.ok);
set.setOnClickListener(本); 大小=(int)的sizeOfText.getTextSize(); 返回视图。
}
@覆盖
公共无效的onClick(查看视图){
INT ID = view.getId(); 如果(ID == R.id.inc){
大小= +1;
sizeOfText.setText(文本);
sizeOfText.setTextSize(大小);
}
如果(ID == R.id.dec){
大小= - 1;
sizeOfText.setText(文本);
sizeOfText.setTextSize(大小);
}
如果(ID == R.id.ok){
解雇();
}
}@覆盖
公共无效onDismiss(DialogInterface对话){
super.onDismiss(对话);
MainActivity.updatedSize =大小;
handler.sendEmptyMessage(0);
}}
In One Of my Activity I have a Menu Option With Text Option When user Click That it redirect to Another Layout where I Kept Two Buttons one is Plus Button and Another One is Minus Button
When user Click that Button I want to Change The TextView Text Size of the BackStack Activity
Here is My Code Below When i click that MenuOPtion the App was Crash and it Report NullPointerException in Logcat
My Detail Activity
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detail_activity);
detailtext= (TextView) findViewById(R.id.detail);
dbHelper = new SqlLiteDbHelper(this);
try {
dbHelper.openDataBase();
} catch (SQLException e) {
e.printStackTrace();
}
sqLiteDatabase = dbHelper.getReadableDatabase();
cursor=dbHelper.getdetails(sqLiteDatabase, selectedData);
if(cursor.moveToFirst())
{
detailtext.setText(cursor.getString(0));
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id==R.id.text_option)
{
Intent intent= new Intent(this,CustomSetting.class);
startActivity(intent);
}
return super.onOptionsItemSelected(item);
}
Detail_menu.xml
<item android:id="@+id/text_option"
android:orderInCategory="100"
android:showAsAction="ifRoom"
android:title="Text Option"
/>
CustomSetting.java
public class CustomSetting extends AppCompatActivity {
DetailActivity detailActivity;
ImageButton plus,minus,close;
int txtSize = 14;
TextView detail=detailActivity.detailtext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_setting);
plus= (ImageButton) findViewById(R.id.plus);
minus= (ImageButton) findViewById(R.id.minus);
close= (ImageButton) findViewById(R.id.close);
plus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (detail.getTextSize() == 14 ||detail.getTextSize() == 15 || detail.getTextSize() == 16 || detail.getTextSize() == 17){
txtSize++;
detail.setTextSize(txtSize);
} else if (detail.getTextSize() == 18) {
txtSize+= 0;
detail.setTextSize(txtSize);
} else{
txtSize+= 0;
detail.setTextSize(txtSize);
}
}
});
minus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (detail.getTextSize() == 15||detail.getTextSize() ==16||detail.getTextSize() ==17|detail.getTextSize() ==18){
txtSize--;
detail.setTextSize(txtSize);
} else {
txtSize += 0;
detail.setTextSize(txtSize);
}
}
});
close.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent= new Intent(CustomSetting.this,DetailActivity.class);
startActivity(intent);
}
});
}
custom_setting.xml
<ImageButton
android:layout_width="50dp"
android:layout_height="40dp"
android:background="@drawable/close"
android:layout_above="@+id/textView"
android:layout_toRightOf="@+id/minus"
android:layout_toEndOf="@+id/minus"
android:id="@+id/close"
/>
<ImageButton
android:layout_width="50dp"
android:layout_height="40dp"
android:background="@drawable/plusign"
android:layout_marginTop="110dp"
android:id="@+id/plus"
android:layout_alignParentTop="true"
android:layout_alignLeft="@+id/textView"
android:layout_alignStart="@+id/textView" />
<ImageButton
android:layout_width="50dp"
android:layout_height="40dp"
android:background="@drawable/minusign"
android:id="@+id/minus"
android:layout_alignTop="@+id/plus"
android:layout_alignRight="@+id/textView"
android:layout_alignEnd="@+id/textView" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Change Text Size"
android:id="@+id/textView"
android:layout_above="@+id/minus"
android:layout_centerHorizontal="true"
android:textColor="#FFFFFF"
/>
Logcat:
Process: com.example.aa.sidd, PID: 23413
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.aa.sidd/com.example.aa.sidd.CustomSetting}: android.view.InflateException: Binary XML file line #17: Error inflating class <unknown>
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2436)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2498)
at android.app.ActivityThread.access$900(ActivityThread.java:179)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1324)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5641)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1288)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1104)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #17: Error inflating class <unknown>
at android.view.LayoutInflater.createView(LayoutInflater.java:626)
Display the new layout in the form of a DialogFragment. The idea is to show the increase/Decrease option in the form of a DialogFragment popup. you can increase/decrease size from the popup. Once the popup dismisses the selected size is set to the TextView in your Activity.
MainActivity.java
public class MainActivity extends AppCompatActivity {
public static int updatedSize;
TextView greetingText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
greetingText = (TextView)findViewById(R.id.hello_world_text);
}
@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_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
mycustomLayout();
return true;
}
return super.onOptionsItemSelected(item);
}
public void mycustomLayout(){
FragmentManager manager = getFragmentManager();
PopUp popUp = new PopUp(new FragmentDismissHandler());
popUp.show(manager,"POPUP");
}
public void refreshText(){
if( updatedSize>0)
greetingText.setTextSize(updatedSize);
}
private class FragmentDismissHandler extends Handler {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
refreshText();
}
}
}
PopUp.java (custom layout as DialogFragment)
public class PopUp extends DialogFragment implements View.OnClickListener{
ImageButton increase,decrease,set;
TextView sizeOfText;
static int size;
Handler handler;
public PopUp(Handler handler) {
this.handler = handler;
}
public PopUp(){
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
getDialog().setTitle("change text size");
View view = inflater.inflate(R.layout.my_custom_layout, container, false);
increase = (ImageButton)view.findViewById(R.id.inc);
increase.setOnClickListener(this);
decrease = (ImageButton)view.findViewById(R.id.dec);
decrease.setOnClickListener(this);
sizeOfText = (TextView)view.findViewById(R.id.size_text);
sizeOfText.setText("text");
set = (ImageButton)view.findViewById(R.id.ok);
set.setOnClickListener(this);
size = (int) sizeOfText.getTextSize();
return view;
}
@Override
public void onClick(View view) {
int id= view.getId();
if(id==R.id.inc){
size = size +1;
sizeOfText.setText("text");
sizeOfText.setTextSize(size);
}
if(id== R.id.dec){
size = size - 1;
sizeOfText.setText("text");
sizeOfText.setTextSize(size);
}
if(id== R.id.ok){
dismiss();
}
}
@Override
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
MainActivity.updatedSize = size;
handler.sendEmptyMessage(0);
}
}
这篇关于应用程序崩溃当试图通过点击按钮来更改TextView的TEXTSIZE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!