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在安卓系统中，应用程序未安装在您的手机上。

androidxml
3
我是一个新手，正在学习Android。我尝试运行我的Android应用程序，在控制台上没有出现任何错误，但是当我在模拟器中打开应用程序时，我会收到一个toast消息“您的手机上未安装该应用程序”，与此相同的问题在这个论坛上询问，他们说：“如果您的AndroidManifest.xml文件中有两个MainActivity声明，就会出现这种情况。” 我试过了，但还是不行。
AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.intent"
android:versionCode="1"
android:versionName="1.0" > 
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
    android:name=".Activity1"
    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=".Activity2"
android:label="@string/app_name">
   </activity>
 </application>
</manifest>

活动1

package com.example.intent;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Activity1 extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_activity1);
     addListenerOnButton();
}

 public void addListenerOnButton() {
     final Context context = this;
    Button b1=(Button)findViewById(R.id.textView1);
    b1.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
             Intent intent = new Intent(context,Activity2.class);
             startActivity(intent); 

        }
    });

}



}

Activity2.java

package com.example.intent;

import android.app.Activity;
import android.os.Bundle;

 public class Activity2  extends Activity{
 @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_activity2);

    }
 }

activity_activity1.xml-->Activity1.java

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >    
 <TextView
     android:id="@+id/textView1"
     android:layout_width="252dp"
     android:layout_height="40dp"
     android:layout_gravity="center_horizontal"
     android:text="@string/t1"
     android:textAppearance="?android:attr/textAppearanceLarge" />
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/intent"/>
    </LinearLayout>

activity_activity2.xml --> Activity2.java

<?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="@string/t2"
     />
    </LinearLayout>

String.xml

 <resources>
  <string name="app_name">Intent</string>
  <string name="intent">Click me to Another Screen</string>
  <string name="t1">I am Screen 1!</string>
  <string name="t2">I am Screen 2!</string>
  <string name="hello_world">Hello world!</string>
  <string name="menu_settings">Settings</string>
  <string name="title_activity_activity1">Activity1</string>
 </resources>

日志记录器

      09-07 17:10:01.281: D/AndroidRuntime(756): Shutting down VM
09-07 17:10:01.291: W/dalvikvm(756): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
09-07 17:10:01.301: E/AndroidRuntime(756): FATAL EXCEPTION: main
09-07 17:10:01.301: E/AndroidRuntime(756): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.intent/com.example.intent.Activity1}: java.lang.ClassCastException: android.widget.TextView
09-07 17:10:01.301: E/AndroidRuntime(756):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
09-07 17:10:01.301: E/AndroidRuntime(756):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
09-07 17:10:01.301: E/AndroidRuntime(756):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
09-07 17:10:01.301: E/AndroidRuntime(756):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
09-07 17:10:01.301: E/AndroidRuntime(756):  at android.os.Handler.dispatchMessage(Handler.java:99)
09-07 17:10:01.301: E/AndroidRuntime(756):  at android.os.Looper.loop(Looper.java:123)
09-07 17:10:01.301: E/AndroidRuntime(756):  at android.app.ActivityThread.main(ActivityThread.java:4627)
09-07 17:10:01.301: E/AndroidRuntime(756):  at java.lang.reflect.Method.invokeNative(Native Method)
09-07 17:10:01.301: E/AndroidRuntime(756):  at java.lang.reflect.Method.invoke(Method.java:521)
09-07 17:10:01.301: E/AndroidRuntime(756):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-07 17:10:01.301: E/AndroidRuntime(756):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-07 17:10:01.301: E/AndroidRuntime(756):  at dalvik.system.NativeStart.main(Native Method)
09-07 17:10:01.301: E/AndroidRuntime(756): Caused by: java.lang.ClassCastException: android.widget.TextView
09-07 17:10:01.301: E/AndroidRuntime(756):  at com.example.intent.Activity1.addListenerOnButton(Activity1.java:22)
09-07 17:10:01.301: E/AndroidRuntime(756):  at com.example.intent.Activity1.onCreate(Activity1.java:17)
09-07 17:10:01.301: E/AndroidRuntime(756):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-07 17:10:01.301: E/AndroidRuntime(756):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
09-07 17:10:01.301: E/AndroidRuntime(756):  ... 11 more
09-07 17:10:10.700: I/Process(756): Sending signal. PID: 756 SIG: 9
09-07 17:15:13.781: D/AndroidRuntime(812): Shutting down VM
09-07 17:15:13.781: W/dalvikvm(812): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
09-07 17:15:13.801: E/AndroidRuntime(812): FATAL EXCEPTION: main
09-07 17:15:13.801: E/AndroidRuntime(812): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.intent/com.example.intent.Activity1}: java.lang.ClassCastException: android.widget.TextView
09-07 17:15:13.801: E/AndroidRuntime(812):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
09-07 17:15:13.801: E/AndroidRuntime(812):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
09-07 17:15:13.801: E/AndroidRuntime(812):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
09-07 17:15:13.801: E/AndroidRuntime(812):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
09-07 17:15:13.801: E/AndroidRuntime(812):  at android.os.Handler.dispatchMessage(Handler.java:99)
09-07 17:15:13.801: E/AndroidRuntime(812):  at android.os.Looper.loop(Looper.java:123)
09-07 17:15:13.801: E/AndroidRuntime(812):  at android.app.ActivityThread.main(ActivityThread.java:4627)
09-07 17:15:13.801: E/AndroidRuntime(812):  at java.lang.reflect.Method.invokeNative(Native Method)
09-07 17:15:13.801: E/AndroidRuntime(812):  at java.lang.reflect.Method.invoke(Method.java:521)
09-07 17:15:13.801: E/AndroidRuntime(812):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-07 17:15:13.801: E/AndroidRuntime(812):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-07 17:15:13.801: E/AndroidRuntime(812):  at dalvik.system.NativeStart.main(Native Method)
09-07 17:15:13.801: E/AndroidRuntime(812): Caused by: java.lang.ClassCastException: android.widget.TextView
09-07 17:15:13.801: E/AndroidRuntime(812):  at com.example.intent.Activity1.addListenerOnButton(Activity1.java:22)
09-07 17:15:13.801: E/AndroidRuntime(812):  at com.example.intent.Activity1.onCreate(Activity1.java:17)
09-07 17:15:13.801: E/AndroidRuntime(812):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-07 17:15:13.801: E/AndroidRuntime(812):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
09-07 17:15:13.801: E/AndroidRuntime(812):  ... 11 more
09-07 17:20:13.841: I/Process(812): Sending signal. PID: 812 SIG: 9
09-07 17:24:50.690: D/AndroidRuntime(840): Shutting down VM
09-07 17:24:50.690: W/dalvikvm(840): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
09-07 17:24:50.710: E/AndroidRuntime(840): FATAL EXCEPTION: main
09-07 17:24:50.710: E/AndroidRuntime(840): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.intent/com.example.intent.Activity1}: java.lang.ClassCastException: android.widget.TextView
09-07 17:24:50.710: E/AndroidRuntime(840):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
09-07 17:24:50.710: E/AndroidRuntime(840):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
09-07 17:24:50.710: E/AndroidRuntime(840):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
09-07 17:24:50.710: E/AndroidRuntime(840):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
09-07 17:24:50.710: E/AndroidRuntime(840):  at android.os.Handler.dispatchMessage(Handler.java:99)
09-07 17:24:50.710: E/AndroidRuntime(840):  at android.os.Looper.loop(Looper.java:123)
09-07 17:24:50.710: E/AndroidRuntime(840):  at android.app.ActivityThread.main(ActivityThread.java:4627)
09-07 17:24:50.710: E/AndroidRuntime(840):  at java.lang.reflect.Method.invokeNative(Native Method)
09-07 17:24:50.710: E/AndroidRuntime(840):  at java.lang.reflect.Method.invoke(Method.java:521)
09-07 17:24:50.710: E/AndroidRuntime(840):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-07 17:24:50.710: E/AndroidRuntime(840):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-07 17:24:50.710: E/AndroidRuntime(840):  at dalvik.system.NativeStart.main(Native Method)
09-07 17:24:50.710: E/AndroidRuntime(840): Caused by: java.lang.ClassCastException: android.widget.TextView
09-07 17:24:50.710: E/AndroidRuntime(840):  at com.example.intent.Activity1.addListenerOnButton(Activity1.java:22)
09-07 17:24:50.710: E/AndroidRuntime(840):  at com.example.intent.Activity1.onCreate(Activity1.java:17)
09-07 17:24:50.710: E/AndroidRuntime(840):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-07 17:24:50.710: E/AndroidRuntime(840):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
09-07 17:24:50.710: E/AndroidRuntime(840):  ... 11 more
卸载应用程序，然后重新安装。 - Ketan Ahir
https://dev59.com/Ll7Va4cB1Zd3GeqPNdMv#8698423 - Android
3个回答
3
你在这里做错了。
  android:name="activity_activity1"
  android:name="activity_activity2"

请使用以下代码：

使用此代码

<activity
    android:name=".Activity1"
    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=".Activity2"
    android:label="@string/app_name">
</activity>
我改了我的代码，但它不起作用，我发布了我的logcat活动，请看一下我的帖子。 - Krish
是的，我按照您的答案更改了我的清单文件，但仍然出现异常，请查看我的帖子，我在那里发布了我的日志活动。 - Krish
1
@Raghunandan 非常感谢，我犯了两个错误，一个是清单文件，另一个是类型转换。 - Krish
2
@Ketan非常感谢，我犯了两个错误，一个是清单文件，另一个是类型转换。 - Krish
1
@Krish 我想你应该接受我的答案，因为Raghunandan比我更有钱，而且我在这里花了很多时间。哈哈哈 - Ketan Ahir
显示剩余3条评论
1
像这样添加活动
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.intent"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="15" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".Activity1"
        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=".Activity2"
        android:label="@string/app_name">
        </activity>
</application>

</manifest>
1
你做错了。
   Button b1=(Button)findViewById(R.id.textView1);

将按钮转换为文本视图
更改为
  Button b1=(Button)findViewById(R.id.button1);

同时使用活动上下文

  Intent intent = new Intent(Activity1.this,Activity2.class);
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