Question

目的是从编辑视图中获取文本，并在单击按钮时在另一个活动中的TextView中显示该文本。我的问题：只要我点击按钮，应用就会停止。

Main.java：

package com.satish.explicitintents;

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 Main extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

        final EditText et = (EditText) findViewById(R.id.editText1);

        Button b = (Button) findViewById(R.id.button1);
        b.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent intent =new Intent(Main.this, Second.class); 
            intent.putExtra("thetext", et.getText().toString());
            startActivity(intent);
        }
    }); 
    }
}

Second.java：

package com.satish.explicitintents;

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

public class Second extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);

        TextView tv = (TextView) findViewById(R.id.textView1);
        tv.setText(getIntent().getExtras().getString("thetext"));
    }
}

清单文件：

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

<uses-sdk
    android:minSdkVersion="9"
    android:targetSdkVersion="18" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.satish.explicitintents.Main"
        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.satish.explicitintent.Second"
                android:label="@string/app_name"/>
</application>

</manifest>

堆栈跟踪：

02-23 17:42:03.124: D/AndroidRuntime(4445): Shutting down VM
02-23 17:42:03.124: W/dalvikvm(4445): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-23 17:42:03.144: E/AndroidRuntime(4445): FATAL EXCEPTION: main
02-23 17:42:03.144: E/AndroidRuntime(4445): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.satish.explicitintents/com.satish.explicitintents.Second}; have you declared this activity in your AndroidManifest.xml?
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.app.Activity.startActivityForResult(Activity.java:2827)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.app.Activity.startActivity(Activity.java:2933)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at com.satish.explicitintents.Main$1.onClick(Main.java:28)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.view.View.performClick(View.java:2485)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.view.View$PerformClick.run(View.java:9080)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.os.Handler.handleCallback(Handler.java:587)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.os.Handler.dispatchMessage(Handler.java:92)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.os.Looper.loop(Looper.java:123)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at android.app.ActivityThread.main(ActivityThread.java:3683)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at java.lang.reflect.Method.invokeNative(Native Method)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at java.lang.reflect.Method.invoke(Method.java:507)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-23 17:42:03.144: E/AndroidRuntime(4445):     at dalvik.system.NativeStart.main(Native Method)
02-23 17:42:24.654: W/KeyCharacterMap(4455): No keyboard for id 0
02-23 17:42:24.654: W/KeyCharacterMap(4455): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
02-23 17:42:25.904: D/AndroidRuntime(4455): Shutting down VM
02-23 17:42:25.904: W/dalvikvm(4455): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-23 17:42:25.924: E/AndroidRuntime(4455): FATAL EXCEPTION: main
02-23 17:42:25.924: E/AndroidRuntime(4455): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.satish.explicitintents/com.satish.explicitintents.Second}; have you declared this activity in your AndroidManifest.xml?
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.app.Activity.startActivityForResult(Activity.java:2827)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.app.Activity.startActivity(Activity.java:2933)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at com.satish.explicitintents.Main$1.onClick(Main.java:28)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.view.View.performClick(View.java:2485)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.view.View$PerformClick.run(View.java:9080)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.os.Handler.handleCallback(Handler.java:587)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.os.Handler.dispatchMessage(Handler.java:92)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.os.Looper.loop(Looper.java:123)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at android.app.ActivityThread.main(ActivityThread.java:3683)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at java.lang.reflect.Method.invokeNative(Native Method)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at java.lang.reflect.Method.invoke(Method.java:507)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-23 17:42:25.924: E/AndroidRuntime(4455):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

android.content.ActivityNotFoundException：无法找到显式活动课 {com.satish.explicitintents / com.satish.explicitintents.Second};有你在AndroidManifest.xml中声明了这个活动吗？

堆栈跟踪表明您尚未在清单中声明活动。

您的包名错误

更改为

 <activity android:name="com.satish.explicitintents.Second" 
 //explicitintents not explicitintent

检查

 package="com.satish.explicitintents"

或者只是

 <activity android:name=".Second"

Answer 2

问题出在您的清单文件中。替换以下行 -

<activity android:name="com.satish.explicitintent.Second"
  android:label="@string/app_name"/>

与 -

 <activity android:name="com.satish.explicitintents.Second"
            android:label="@string/app_name"/>

您的包裹名称错误。

Answer 3

在指定第二个活动的路径时，清单文件中有错误。你需要使用：

<activity android:name="com.satish.explicitintents.Second"
            android:label="@string/app_name"/>

明确的意图 - Android

3 个答案: