活动之间的Android应用程序交换停止

Question

Hei guys。我是Android编程的新手。我试图制作一个控制RC汽车的应用程序（Arduino）。在这个应用程序是下一个活动：

1. 按钮命令
2. 倾斜指令
3. 声音命令
4. 说明
5. 关于

当我打开应用程序突然停止和我不知道为什么。有人可以通过查看代码来帮助我，并告诉我我做错了什么。非常感谢。

Button buttonCommand; 
Button tiltCommand; 
Button vocalCommand; 
Button instructions; 
Button about; 
Button arduino; // Links Button 
Button android; // Links Button 

public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.content_main); 

    buttonCommand = (Button)findViewById(R.id.buttons); 
    tiltCommand = (Button)findViewById(R.id.tilt); 
    vocalCommand = (Button)findViewById(R.id.vocal); 
    instructions = (Button)findViewById(R.id.instructions); 
    about = (Button)findViewById(R.id.about); 
    arduino = (Button)findViewById(R.id.arduino); 
    android = (Button)findViewById(R.id.android); 
} 

public void onClickButton(View view){ 
    Intent i = new Intent(getApplicationContext(),ButtonCommand.class); // ButtonCommand Activity 
    startActivity(i); 
} 

public void onClickTilt(View view){ 
    Intent i = new Intent(getApplicationContext(),TiltCommand.class); // TiltCommand Activity 
    startActivity(i); 
} 

public void onClickVocal(View view){ 
    Intent i = new Intent(getApplicationContext(),VocalCommand.class); // VocalCommand Activity 
    startActivity(i); 
} 

public void onClickInstructions(View view){ 
    Intent i = new Intent(getApplicationContext(),Instructions.class); // Instructions Activity 
    startActivity(i); 
} 

public void onClickAbout(View view){ 
    Intent i = new Intent(getApplicationContext(),About.class); // About Activity 
    startActivity(i); 
} 

public void onClickArduino(View view){ 
    Intent intent = new Intent(); 
    intent.setAction(Intent.ACTION_VIEW); 
    intent.addCategory(Intent.CATEGORY_BROWSABLE); 
    intent.setData(Uri.parse("http://forum.arduino.cc/")); 
    startActivity(intent); 
} 

public void onClickAndroid(View view){ 
    Intent intent = new Intent(); 
    intent.setAction(Intent.ACTION_VIEW); 
    intent.addCategory(Intent.CATEGORY_BROWSABLE); 
    intent.setData(Uri.parse("http://forum.xda-developers.com/")); 
    startActivity(intent); 
} 

Answer 1

如果您的应用程序停止在启动，很可能你缺少添加你的活动的注册表到您AndroidManifest.xml：

<activity android:name=".ButtonCommand" /> 
    <activity android:name=".TiltCommand" /> 
    <activity android:name=".VocalCommand" /> 
    <activity android:name=".Instructions" /> 
    <activity android:name=".About" /> 

乔治，你需要为每个按钮例如创建一个OnClickListener ：

buttonCommand = (Button)findViewById(R.id.buttons); 
buttonCommand.setOnClickListener(new OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         Intent i = new Intent(getApplicationContext(),ButtonCommand.class); // ButtonCommand Activity 
         startActivity(i); 
        } 
       }); 

加：和互联网权限打开网址：

<uses-permission android:name="android.permission.INTERNET" />