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為何不能加載點擊事件，只要打開點擊事件，及時里面內(nèi)容為空，也會出錯，代碼錯在哪里？

package?com.giawei.fragementdemo;

import?android.support.v7.app.ActionBarActivity;
import?android.support.v7.app.ActionBar;
import?android.support.v4.app.Fragment;
import?android.content.Intent;
import?android.os.Bundle;
import?android.view.LayoutInflater;
import?android.view.Menu;
import?android.view.MenuItem;
import?android.view.View;
import?android.view.View.OnClickListener;
import?android.view.ViewGroup;
import?android.widget.Button;
import?android.os.Build;

public?class?MainActivity?extends?ActionBarActivity?{

	private?Button?button1;
	@Override
	protected?void?onCreate(Bundle?savedInstanceState)?{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		button1=(Button)?findViewById(R.id.button1);
		button1.setOnClickListener(new?OnClickListener()?{
			
			@Override
			public?void?onClick(View?arg0)?{
				//?TODO?Auto-generated?method?stub
			//	Intent?intent=new?Intent(MainActivity.this,MainActivity2.class);
			//	startActivity(intent);
				
			}
		});

		if?(savedInstanceState?==?null)?{
			getSupportFragmentManager().beginTransaction()
					.add(R.id.container,?new?PlaceholderFragment()).commit();
		}
	}

	@Override
	public?boolean?onCreateOptionsMenu(Menu?menu)?{

		//?Inflate?the?menu;?this?adds?items?to?the?action?bar?if?it?is?present.
		getMenuInflater().inflate(R.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();
		if?(id?==?R.id.action_settings)?{
			return?true;
		}
		return?super.onOptionsItemSelected(item);
	}

	/**
	?*?A?placeholder?fragment?containing?a?simple?view.
	?*/
	public?static?class?PlaceholderFragment?extends?Fragment?{

		public?PlaceholderFragment()?{
		}

		@Override
		public?View?onCreateView(LayoutInflater?inflater,?ViewGroup?container,
				Bundle?savedInstanceState)?{
			View?rootView?=?inflater.inflate(R.layout.fragment_main,?container,
					false);
			return?rootView;
		}
	}

}


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2 回答

09-17 11:46:34.169: D/AndroidRuntime(1528): Shutting down VM

09-17 11:46:34.169: W/dalvikvm(1528): threadid=1: thread exiting with uncaught exception (group=0xb2a4dba8)

09-17 11:46:34.189: E/AndroidRuntime(1528): FATAL EXCEPTION: main

09-17 11:46:34.189: E/AndroidRuntime(1528): Process: com.giawei.fragementdemo, PID: 1528

09-17 11:46:34.189: E/AndroidRuntime(1528): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.giawei.fragementdemo/com.giawei.fragementdemo.MainActivity}: java.lang.NullPointerException

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.app.ActivityThread.access$800(ActivityThread.java:135)

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.os.Handler.dispatchMessage(Handler.java:102)

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.os.Looper.loop(Looper.java:136)

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.app.ActivityThread.main(ActivityThread.java:5017)

09-17 11:46:34.189: E/AndroidRuntime(1528): at java.lang.reflect.Method.invokeNative(Native Method)

09-17 11:46:34.189: E/AndroidRuntime(1528): at java.lang.reflect.Method.invoke(Method.java:515)

09-17 11:46:34.189: E/AndroidRuntime(1528): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)

09-17 11:46:34.189: E/AndroidRuntime(1528): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)

09-17 11:46:34.189: E/AndroidRuntime(1528): at dalvik.system.NativeStart.main(Native Method)

09-17 11:46:34.189: E/AndroidRuntime(1528): Caused by: java.lang.NullPointerException

09-17 11:46:34.189: E/AndroidRuntime(1528): at com.giawei.fragementdemo.MainActivity.onCreate(MainActivity.java:25)

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.app.Activity.performCreate(Activity.java:5231)

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)

09-17 11:46:34.189: E/AndroidRuntime(1528): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)

09-17 11:46:34.189: E/AndroidRuntime(1528): ... 11 more

09-17 11:47:08.179: I/Process(1528): Sending signal. PID: 1528 SIG: 9

09-17 11:51:35.439: D/AndroidRuntime(1575): Shutting down VM

09-17 11:51:35.439: W/dalvikvm(1575): threadid=1: thread exiting with uncaught exception (group=0xb2a4dba8)

09-17 11:51:35.449: E/AndroidRuntime(1575): FATAL EXCEPTION: main

09-17 11:51:35.449: E/AndroidRuntime(1575): Process: com.giawei.fragementdemo, PID: 1575

09-17 11:51:35.449: E/AndroidRuntime(1575): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.giawei.fragementdemo/com.giawei.fragementdemo.MainActivity}: java.lang.NullPointerException

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.app.ActivityThread.access$800(ActivityThread.java:135)

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.os.Handler.dispatchMessage(Handler.java:102)

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.os.Looper.loop(Looper.java:136)

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.app.ActivityThread.main(ActivityThread.java:5017)

09-17 11:51:35.449: E/AndroidRuntime(1575): at java.lang.reflect.Method.invokeNative(Native Method)

09-17 11:51:35.449: E/AndroidRuntime(1575): at java.lang.reflect.Method.invoke(Method.java:515)

09-17 11:51:35.449: E/AndroidRuntime(1575): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)

09-17 11:51:35.449: E/AndroidRuntime(1575): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)

09-17 11:51:35.449: E/AndroidRuntime(1575): at dalvik.system.NativeStart.main(Native Method)

09-17 11:51:35.449: E/AndroidRuntime(1575): Caused by: java.lang.NullPointerException

09-17 11:51:35.449: E/AndroidRuntime(1575): at com.giawei.fragementdemo.MainActivity.onCreate(MainActivity.java:31)

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.app.Activity.performCreate(Activity.java:5231)

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)

09-17 11:51:35.449: E/AndroidRuntime(1575): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)

09-17 11:51:35.449: E/AndroidRuntime(1575): ... 11 more

09-17 11:51:40.299: I/Process(1575): Sending signal. PID: 1575 SIG: 9


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出錯顯示 空指針，但是不知道在哪里出錯

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為何不能加載點擊事件，只要打開點擊事件，及時里面內(nèi)容為空，也會出錯，代碼錯在哪里？

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