E/AndroidRuntime：致命异常：主要

-6

此错误来我一直在修改这些点击听众E/AndroidRuntime：致命异常：主要

后

10-14 12:22:47.811 14626-14626/? E/AndroidRuntime: FATAL EXCEPTION: main 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime: Process: com.thebubble.animationstransitions, PID: 14626 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.thebubble.animationstransitions/com.thebubble.animationstransitions.MainActivity}: java.lang.NullPointerException 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2343) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread.access$800(ActivityThread.java:154) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1326) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:110) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:193) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5315) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:515) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:836) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime: Caused by: java.lang.NullPointerException 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at com.thebubble.animationstransitions.MainActivity.onCreate(MainActivity.java:28) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.Activity.performCreate(Activity.java:5283) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307) 
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread.access$800(ActivityThread.java:154)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1326)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:110)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:193)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5315)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:515)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:836)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)  
10-14 12:22:47.811 14626-14626/? E/AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method)  
10-14 12:22:47.827 14626-14626/? I/Process: Sending signal. PID: 14626 SIG: 9

MainActivity.java代码

package com.thebubble.animationstransitions; 

import android.os.Bundle; 
import android.support.v7.app.ActionBarActivity; 
import android.transition.TransitionManager; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.RelativeLayout; 

public class MainActivity extends ActionBarActivity { 
    int touchCount; 

    Button theButton; 
    ViewGroup mainView; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 


     theButton.setOnClickListener(
       new Button.OnClickListener(){ 
        boolean bull = true; 


        public void onClick(View v){ 
         moveButton(bull); 
         if(bull==true){ 
          bull = false; 
         }else{ 
          bull =true; 
         } 

        } 


       } 
     ); 
    } 
    public void moveButton(boolean decision) { 

     if (decision) { 


      View theButton = findViewById(R.id.theButton); 

      TransitionManager.beginDelayedTransition(mainView); 


      //Changes the position of the button 
      RelativeLayout.LayoutParams positionRules = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); 
      positionRules.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE); 
      positionRules.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, RelativeLayout.TRUE); 
      theButton.setLayoutParams(positionRules); 


      ViewGroup.LayoutParams sizeRules = theButton.getLayoutParams(); 
      sizeRules.width = 450; 
      sizeRules.height = 450; 
      theButton.setLayoutParams(sizeRules); 
     } else { 


      View theButton = findViewById(R.id.theButton); 

      TransitionManager.beginDelayedTransition(mainView); 


      //Changes the position of the button 
      RelativeLayout.LayoutParams positionRules = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); 
      positionRules.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE); 
      positionRules.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE); 
      theButton.setLayoutParams(positionRules); 


      ViewGroup.LayoutParams sizeRules = theButton.getLayoutParams(); 
      sizeRules.width = 150; 
      sizeRules.height = 50; 
      theButton.setLayoutParams(sizeRules); 
     } 
    } 



    @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) { 
     // 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); 
    } 
}

它只是一个简单的代码来改变位置和大小的一个按钮，并创建一个简单的过渡即时通讯初学者，所以我需要更详细的请求

来源

2015-10-14 Sushant Baskota

'theButton = null' –

下一次尝试调试您的应用程序。 – PatrickMA

你忘了初始化按钮theButton。

插入：

theButton = (Button) findViewById(R.id.yourButtonId);

之前设置点击收听。

来源

2015-10-14 07:34:12

E/AndroidRuntime：致命异常：主要

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