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java - "Unfortunately My App has stopped"

转载 作者:行者123 更新时间:2023-11-29 05:44:03 26 4
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我正在为 android 创建一个应用程序,但发现错误“不幸的是我的应用程序已停止”所以请帮助我

AndroidManifest.xml

            <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.techtips"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.techblogon.activitylifecycleexample.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=".SecondActivity">
</activity>

</application>

</manifest>

资源/布局

layout2.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
android:id="@+id/textView1"
android:layout_marginTop="150dp"
android:layout_gravity="center_horizontal"
android:textSize="23dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This Is Second Activity" />

</LinearLayout>

main.xml

        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView

android:id="@+id/textView1"
android:layout_gravity="center_horizontal"
android:textSize="23dp"
android:layout_marginTop="150dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This Is Fist Activity Activity"/>

<Button
android:id="@+id/button1"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Second Activity "
android:onClick="startSecondActivity"/>


</LinearLayout>

src/com.example.techtip/ MainActivity.java

        package com.example.techtips;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.View;
import android.widget.Toast;


public class MainActivity extends Activity {
/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Toast.makeText(this, "On Create Called In First Activity",

Toast.LENGTH_LONG).show();
Log.i("FirstActivity", "Inside onCreate");
}

@Override

protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Toast.makeText(this, "On Start Called In First Activity",

Toast.LENGTH_LONG).show();
Log.i("FirstActivity", "Inside onStart");

}

@Override

protected void onResume()

{

// TODO Auto-generated method stub

super.onResume();

Toast.makeText(this, "On Resume Called In First Activity",

Toast.LENGTH_LONG).show();
Log.i("FirstActivity", "Inside onResume");
}

@Override

protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Toast.makeText(this, "On Pause Called In First Activity",

Toast.LENGTH_LONG).show();
Log.i("FirstActivity", "Inside onPause");
}

@Override

protected void onStop() {
// TODO Auto-generated method stub
super.onStop();

Toast.makeText(this, "On Stop Called In First Activity", Toast.LENGTH_LONG).show();
Log.i("FirstActivity", "Inside onStop");
}

@Override

protected void onDestroy()
{
// TODO Auto-generated method stub
super.onDestroy();
Toast.makeText(this, "On Destroy Called In First Activity",

Toast.LENGTH_LONG).show();
Log.i("FirstActivity", "Inside onDestroy");

}
public void startSecondActivity(View V)
{
// create an new Intent and Start Second Activity
Intent intent=new Intent(this,SecondActivity.class);
startActivity(intent);
}
}

SecondActivity.java

  package com.example.techtips;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;


public class SecondActivity extends Activity
{
/** Called when the activity is first created. */


@Override

public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.layout2);
Toast.makeText(this, "On Create Called In Second Activity",

Toast.LENGTH_LONG).show();
Log.i("SecondActivity", "Inside onCreate");

}

@Override

protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Toast.makeText(this, "On Start Called In Second Activity",

Toast.LENGTH_LONG).show();
Log.i("SecondActivity", "Inside onStart");
}

@Override

protected void onResume()
{
// TODO Auto-generated method stub
super.onResume();

Toast.makeText(this, "On Resume Called In Second Activity",

Toast.LENGTH_LONG).show();

Log.i("SecondActivity", "Inside onResume");
}

@Override

protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Toast.makeText(this, "On Pause Called In Second Activity",

Toast.LENGTH_LONG).show();
Log.i("SecondActivity", "Inside onPause");
}


@Override

protected void onStop() {
// TODO Auto-generated method stub
super.onStop();

Toast.makeText(this, "On Stop Called In Second Activity",

Toast.LENGTH_LONG).show();

Log.i("SecondActivity", "Inside onStop");
}

@Override

protected void onDestroy()
{
// TODO Auto-generated method stub
super.onDestroy();
Toast.makeText(this, "On Destroy Called In Second Activity",

Toast.LENGTH_LONG).show();
Log.i("SecondActivity", "Inside onDestroy");
}
}

请帮他解决问题

也请帮我创建这样简单的应用程序??请帮帮我

图片:i.stack.imgur.com/20iUi.jpg

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