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當我啓動應用程序MainActivity成功發射，但是當我在文本編輯字段中插入文本和我按下按鈕的應用程序崩潰的Android機應用崩潰按下按鈕時，同時獲得意圖
的Android清單文件
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="10" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.sateesh.explicit_intents.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>
<activity android:name= "com.sateesh.explicit_intents.Second"
android:label="@string/app_name">
</activity>
</application>
</manifest>
這是Main_Activity：
package com.sateesh.explicit_intents;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Refernce of UI objects
final EditText et=(EditText)findViewById(R.id.editText1);
Button b =(Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent i= new Intent(MainActivity.this, Second.class);
// Getting
i.putExtra("thetext", et.getText().toString());
startActivity(i);
}
});
}
@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;
}
}
main_activity.xml：
<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=".MainActivity" >
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:ems="10" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_below="@+id/editText1"
android:text="Go To Second Activity" />
</RelativeLayout>
次活動：
package com.sateesh.explicit_intents;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class Second extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv=(TextView)findViewById(R.id.textView1);
tv.setText(getIntent().getExtras().getString("thetext"));
}
}
second.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
當我嘗試在模擬器中運行這個。 MainActivity成功啓動。但是，當我插入文本並按下按鈕程序崩潰，我得到以下錯誤。
10-28 00:43:16.692: D/gralloc_goldfish(2002): Emulator without GPU emulation detected.
10-28 00:43:17.462: W/KeyCharacterMap(2002): No keyboard for id 0
10-28 00:43:17.462: W/KeyCharacterMap(2002): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
10-28 00:43:18.393: D/AndroidRuntime(2002): Shutting down VM
10-28 00:43:18.393: W/dalvikvm(2002): threadid=1: thread exiting with uncaught exception (group=0xb6f794f0)
10-28 00:43:18.433: E/AndroidRuntime(2002): FATAL EXCEPTION: main
10-28 00:43:18.433: E/AndroidRuntime(2002): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sateesh.explicit_intents/com.sateesh.explicit_intents.Second}: java.lang.NullPointerException
10-28 00:43:18.433: E/AndroidRuntime(2002): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
10-28 00:43:18.433: E/AndroidRuntime(2002): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
10-28 00:43:18.433: E/AndroidRuntime(2002): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
10-28 00:43:18.433: E/AndroidRuntime(2002): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
10-28 00:43:18.433: E/AndroidRuntime(2002): at android.os.Handler.dispatchMessage(Handler.java:99)
10-28 00:43:18.433: E/AndroidRuntime(2002): at android.os.Looper.loop(Looper.java:130)
10-28 00:43:18.433: E/AndroidRuntime(2002): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-28 00:43:18.433: E/AndroidRuntime(2002): at java.lang.reflect.Method.invokeNative(Native Method)
10-28 00:43:18.433: E/AndroidRuntime(2002): at java.lang.reflect.Method.invoke(Method.java:507)
10-28 00:43:18.433: E/AndroidRuntime(2002): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
10-28 00:43:18.433: E/AndroidRuntime(2002): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-28 00:43:18.433: E/AndroidRuntime(2002): at dalvik.system.NativeStart.main(Native Method)
10-28 00:43:18.433: E/AndroidRuntime(2002): Caused by: java.lang.NullPointerException
10-28 00:43:18.433: E/AndroidRuntime(2002): at com.sateesh.explicit_intents.Second.onCreate(Second.java:14)
10-28 00:43:18.433: E/AndroidRuntime(2002): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-28 00:43:18.433: E/AndroidRuntime(2002): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
10-28 00:43:18.433: E/AndroidRuntime(2002): ... 11 more
10-28 00:43:20.711: I/Process(2002): Sending signal. PID: 2002 SIG: 9
當我啓動應用程序MainActivity成功發射，但是當我在文本編輯字段中插入文本和我按下按鈕的應用程序崩潰
將其標記爲已回答！ –