12-12 11:11:54.021: W/dalvikvm(794): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
12-12 11:11:54.041: E/AndroidRuntime(794): FATAL EXCEPTION: main
12-12 11:11:54.041: E/AndroidRuntime(794): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.callpeople/com.example.callpeople.MainActivity}: java.lang.NullPointerException
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.os.Handler.dispatchMessage(Handler.java:99)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.os.Looper.loop(Looper.java:137)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.main(ActivityThread.java:5041)
12-12 11:11:54.041: E/AndroidRuntime(794): at java.lang.reflect.Method.invokeNative(Native Method)
12-12 11:11:54.041: E/AndroidRuntime(794): at java.lang.reflect.Method.invoke(Method.java:511)
12-12 11:11:54.041: E/AndroidRuntime(794): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-12 11:11:54.041: E/AndroidRuntime(794): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-12 11:11:54.041: E/AndroidRuntime(794): at dalvik.system.NativeStart.main(Native Method)
12-12 11:11:54.041: E/AndroidRuntime(794): Caused by: java.lang.NullPointerException
12-12 11:11:54.041: E/AndroidRuntime(794): at com.example.callpeople.MainActivity.onCreate(MainActivity.java:20)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.Activity.performCreate(Activity.java:5104)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-12 11:11:54.041: E/AndroidRuntime(794): ... 11 more
上面这是错误 下面是我写的程序
package com.example.callpeople;import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;public class MainActivity extends Activity { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button4=(Button) this.findViewById(R.id.Button4);
button4.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
Intent intent4=new Intent(Intent.ACTION_CALL);
intent4.setData(Uri.parse("tel:10086"));
startActivity(intent4);
}
});
}
}、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.callpeople"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.CALL_PHONE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application></manifest>
、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.callpeople.MainActivity" >
<Button
android:name="@+id/Button4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/button4"
/>
</RelativeLayout>
12-12 11:11:54.041: E/AndroidRuntime(794): FATAL EXCEPTION: main
12-12 11:11:54.041: E/AndroidRuntime(794): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.callpeople/com.example.callpeople.MainActivity}: java.lang.NullPointerException
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.os.Handler.dispatchMessage(Handler.java:99)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.os.Looper.loop(Looper.java:137)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.main(ActivityThread.java:5041)
12-12 11:11:54.041: E/AndroidRuntime(794): at java.lang.reflect.Method.invokeNative(Native Method)
12-12 11:11:54.041: E/AndroidRuntime(794): at java.lang.reflect.Method.invoke(Method.java:511)
12-12 11:11:54.041: E/AndroidRuntime(794): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-12 11:11:54.041: E/AndroidRuntime(794): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-12 11:11:54.041: E/AndroidRuntime(794): at dalvik.system.NativeStart.main(Native Method)
12-12 11:11:54.041: E/AndroidRuntime(794): Caused by: java.lang.NullPointerException
12-12 11:11:54.041: E/AndroidRuntime(794): at com.example.callpeople.MainActivity.onCreate(MainActivity.java:20)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.Activity.performCreate(Activity.java:5104)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-12 11:11:54.041: E/AndroidRuntime(794): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-12 11:11:54.041: E/AndroidRuntime(794): ... 11 more
上面这是错误 下面是我写的程序
package com.example.callpeople;import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;public class MainActivity extends Activity { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button4=(Button) this.findViewById(R.id.Button4);
button4.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
Intent intent4=new Intent(Intent.ACTION_CALL);
intent4.setData(Uri.parse("tel:10086"));
startActivity(intent4);
}
});
}
}、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.callpeople"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.CALL_PHONE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application></manifest>
、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.callpeople.MainActivity" >
<Button
android:name="@+id/Button4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/button4"
/>
</RelativeLayout>
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