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我是新來的Android應用程序開發。雖然學習的應用開發我被困在錯誤：不幸的應用程序已經停止working- Android模擬器
UNFORTUNATELY APP HAS STOPPED WORKING
我的應用程序正常打開，但是當我輸入的文本正確，然後單擊按鈕，它停止工作，並顯示上面的錯誤}
TextPlay。 java的：
import android.widget.EditText;
import android.widget.TextView;
import android.widget.ToggleButton;
public class TextPlay extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.text);
Button ChkCmd = (Button) findViewById(R.id.bResults);
final ToggleButton passTog = (ToggleButton) findViewById(R.id.tbPassword);
final EditText input = (EditText) findViewById(R.id.etCommands);
final TextView display = (TextView) findViewById(R.id.tvDisplay);
passTog.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (passTog.isChecked()) {
input.setInputType(InputType.TYPE_CLASS_TEXT
| InputType.TYPE_TEXT_VARIATION_PASSWORD);
} else {
input.setInputType(InputType.TYPE_CLASS_TEXT);
}
}
});
ChkCmd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String check = input.getText().toString();
if (check.contentEquals("left")) {
display.setGravity(Gravity.LEFT);
} else if (check.contentEquals("right")) {
display.setGravity(Gravity.CENTER);
} else if (check.contentEquals("center")) {
display.setGravity(Gravity.RIGHT);
} else if (check.contentEquals("blue")) {
}
}
});
}
}
這是我MainFest：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.dikshant"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".Splash"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.example.dikshant.MAINACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Menu"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.example.dikshant.MENU" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".TextPlay"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.example.dikshant.TEXTPLAY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
---------------------------------------------------------------------------------
這是我text.xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:padding="20dp"
android:background="@drawable/background2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/etCommands"
android:hint="Type a command"
android:password="true" />
<LinearLayout
android:weightSum="100"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:layout_weight="20"
android:id="@+id/bResults"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Try Command" />
enter code here
<ToggleButton
android:padding="10dp"
android:checked="true"
android:layout_weight="80"
android:id="@+id/tbPassword"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="ToggleButton" />
</LinearLayout>
<TextView
android:id="@+id/tvResults"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Invalid"
android:layout_gravity="center"/>
</LinearLayout>
logcat的
07-16 21:08:06.996: D/dalvikvm(1906): GC_FOR_ALLOC freed 49K, 4% free 3035K/3160K, paused 58ms, total 60ms
07-16 21:08:07.036: I/dalvikvm-heap(1906): Grow heap (frag case) to 5.808MB for 2915856-byte allocation
07-16 21:08:07.096: D/dalvikvm(1906): GC_FOR_ALLOC freed 2K, 3% free 5880K/6008K, paused 57ms, total 57ms
07-16 21:08:07.786: D/(1906): HostConnection::get() New Host Connection established 0xb8bcac50, tid 1906
07-16 21:08:07.846: W/EGL_emulation(1906): eglSurfaceAttrib not implemented
07-16 21:08:07.856: D/OpenGLRenderer(1906): Enabling debug mode 0
07-16 21:09:00.396: D/AndroidRuntime(1906): Shutting down VM
07-16 21:09:00.396: W/dalvikvm(1906): threadid=1: thread exiting with uncaught exception (group=0xb1ac2ba8)
---從現在>>紅色突出顯示的錯誤：
07-16 21:09:00.576: E/AndroidRuntime(1906): FATAL EXCEPTION: main
07-16 21:09:00.576: E/AndroidRuntime(1906): Process: com.example.dikshant, PID: 1906
07-16 21:09:00.576: E/AndroidRuntime(1906): java.lang.NullPointerException
07-16 21:09:00.576: E/AndroidRuntime(1906): at com.example.dikshant.TextPlay$2.onClick(TextPlay.java:51)
07-16 21:09:00.576: E/AndroidRuntime(1906): at android.view.View.performClick(View.java:4438)
07-16 21:09:00.576: E/AndroidRuntime(1906): at android.view.View$PerformClick.run(View.java:18422)
07-16 21:09:00.576: E/AndroidRuntime(1906): at android.os.Handler.handleCallback(Handler.java:733)
07-16 21:09:00.576: E/AndroidRuntime(1906): at android.os.Handler.dispatchMessage(Handler.java:95)
07-16 21:09:00.576: E/AndroidRuntime(1906): at android.os.Looper.loop(Looper.java:136)
07-16 21:09:00.576: E/AndroidRuntime(1906): at android.app.ActivityThread.main(ActivityThread.java:5017)
07-16 21:09:00.576: E/AndroidRuntime(1906): at java.lang.reflect.Method.invokeNative(Native Method)
07-16 21:09:00.576: E/AndroidRuntime(1906): at java.lang.reflect.Method.invoke(Method.java:515)
07-16 21:09:00.576: E/AndroidRuntime(1906): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-16 21:09:00.576: E/AndroidRuntime(1906): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-16 21:09:00.576: E/AndroidRuntime(1906): at dalvik.system.NativeStart.main(Native Method)
請告訴您StackTrace。你遇到了什麼錯誤？在哪一行？ – joao2fast4u
**紅色突出顯示錯誤的logcat ** 07-16 21：09：00.396：W/dalvikvm（1906）：線程ID = 1：螺紋與未捕獲的異常（組= 0xb1ac2ba8）離開 07-16 21：09：00.576： E/AndroidRuntime（1906）：致命異常：主 07-16 21：09：00.576：E/AndroidRuntime（1906）：進程：com.example.dikshant，PID：1906 07-16 21：09：00.576：電子/ AndroidRuntime（1906）：java.lang.NullPointerException 07-16 21：09：00.576：E/AndroidRuntime（1906）：\t at com.example.dikshant.TextPlay $ 2.onClick（TextPlay.java:51） 07- 16 21：09：00.576：E/AndroidRuntime（1906年）：\t在android.view.View.performClick（View.java:4438） – dikshant91
編輯您的問題與全堆棧跟蹤，而不是評論，請。 – joao2fast4u