帮忙看一下如下程序,编译没错,可运行不起来?不知是哪里原因,望指点!
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.ahu"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" /> <application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".CeshiActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<application android:name=".Sec"></application></manifest>package cn.ahu;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import cn.ahu.MyApp;public class CeshiActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
((MyApp)getApplicationContext()).setName("nihao");
Intent intent=new Intent(this,Sec.class);
startActivity(intent);
}
}ackage cn.ahu;import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
import cn.ahu.MyApp;public class Sec extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sec);
String name=((MyApp)getApplicationContext()).getName();
Toast.makeText(this, name, Toast.LENGTH_LONG).show();
}}package cn.ahu;
import android.app.Application;
public class MyApp extends Application {
private String mUserName;
public String getName(){
return mUserName;
}
public void setName(String name){
mUserName = name;
}}在使用MyApp类中的方法是就会出错,不知哪里有问题?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.ahu"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" /> <application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".CeshiActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<application android:name=".Sec"></application></manifest>package cn.ahu;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import cn.ahu.MyApp;public class CeshiActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
((MyApp)getApplicationContext()).setName("nihao");
Intent intent=new Intent(this,Sec.class);
startActivity(intent);
}
}ackage cn.ahu;import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
import cn.ahu.MyApp;public class Sec extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sec);
String name=((MyApp)getApplicationContext()).getName();
Toast.makeText(this, name, Toast.LENGTH_LONG).show();
}}package cn.ahu;
import android.app.Application;
public class MyApp extends Application {
private String mUserName;
public String getName(){
return mUserName;
}
public void setName(String name){
mUserName = name;
}}在使用MyApp类中的方法是就会出错,不知哪里有问题?
android:name=".MyApp" //增加这一行,你继承了,需要添加名字
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".CeshiActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<application android:name=".Sec"></application> 改成<activity android:name=".Sec"></activity>