Question

我正在尝试从我的主要版本中启动新的Activity。我每次执行它都会得到，

Unfortunately, My application has Stopped.

我一直在经历类似的问题，但仍然无法解决我的问题。

以下是Manifest：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.usuario.myapplication">
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

    <activity android:name=".MainActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>
    <activity
        android:name=".secondActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
</application>
</manifest>

爪哇：

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    TextView texto;
    EditText editText;
    Button boton;
    Button boton2;

    private GoogleApiClient client;

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case (R.id.boton):
                String dato = editText.getText().toString();
                Toast.makeText(getApplicationContext(), dato, Toast.LENGTH_SHORT).show();
                texto.setText(dato);
                break;
            case (R.id.boton2):
                Intent intent = new Intent(MainActivity.this, secondActivity.class);
                startActivity(intent);
                break;
        }
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();

        texto = (TextView)findViewById(R.id.texto);
        editText = (EditText)findViewById(R.id.editText);
        boton = (Button)findViewById(R.id.boton);
        boton2 = (Button)findViewById(R.id.boton2);
        boton.setOnClickListener(this);
        boton2.setOnClickListener(this);



    }

    @Override
    public void onStart() {
        super.onStart();

        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        client.connect();
        Action viewAction = Action.newAction(
                Action.TYPE_VIEW, // TODO: choose an action type.
                "Main Page", // TODO: Define a title for the content shown.
                // TODO: If you have web page content that matches this app activity's content,
                // make sure this auto-generated web page URL is correct.
                // Otherwise, set the URL to null.
                Uri.parse("http://host/path"),
                // TODO: Make sure this auto-generated app deep link URI is correct.
                Uri.parse("android-app://com.example.usuario.myapplication/http/host/path")
        );
        AppIndex.AppIndexApi.start(client, viewAction);
    }

    @Override
    public void onStop() {
        super.onStop();

        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        Action viewAction = Action.newAction(
                Action.TYPE_VIEW, // TODO: choose an action type.
                "Main Page", // TODO: Define a title for the content shown.
                // TODO: If you have web page content that matches this app activity's content,
                // make sure this auto-generated web page URL is correct.
                // Otherwise, set the URL to null.
                Uri.parse("http://host/path"),
                // TODO: Make sure this auto-generated app deep link URI is correct.
                Uri.parse("android-app://com.example.usuario.myapplication/http/host/path")
        );
        AppIndex.AppIndexApi.end(client, viewAction);
        client.disconnect();
    }
}

XML：

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    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="com.example.usuario.myapplication.MainActivity">

    <TextView
        android:id="@+id/texto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="ingresar dato" />

    <Button
        android:id="@+id/boton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/boton" />

    <Button
        android:id="@+id/boton2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="new activity" />

</LinearLayout>

以下是Logcat：

01-24 14:27:42.042 8033-8033/com.example.usuario.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.example.usuario.myapplication, PID: 8033
                  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.usuario.myapplication/com.example.usuario.myapplication.secondActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                      at android.app.ActivityThread.-wrap11(ActivityThread.java)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                      at android.os.Handler.dispatchMessage(Handler.java:102)
                      at android.os.Looper.loop(Looper.java:148)
                      at android.app.ActivityThread.main(ActivityThread.java:5417)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                   Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
                      at android.support.v7.app.AppCompatDelegateImplV7.setSupportActionBar(AppCompatDelegateImplV7.java:198)
                      at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:99)
                      at com.example.usuario.myapplication.secondActivity.onCreate(secondActivity.java:17)
                      at android.app.Activity.performCreate(Activity.java:6237)
                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                      at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                      at android.os.Handler.dispatchMessage(Handler.java:102) 
                      at android.os.Looper.loop(Looper.java:148) 
                      at android.app.ActivityThread.main(ActivityThread.java:5417) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

第二项活动：

package com.example.usuario.myapplication;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;

public class secondActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });
}

}

Answer 1

根据logcat日志;实施SecondActivity文件和android:theme="@style/AppTheme.NoActionBar"类之间存在冲突。

你有两个解决方案，但实现其中任何一个：

您可以删除完整的两行“工具栏”实施代码。
您可以在清单文件中进行如下更改：
lists

希望它会帮助你。

干杯！

Answer 2

从Manifest文件中删除此内容：

<intent-filter>
     <action android:name="android.intent.action.MAIN" /> 
     <category android:name="android.intent.category.DEFAULT" />
</intent-filter>

Answer 3

变化：

<activity
        android:name=".secondActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

要：

<activity
    android:name=".secondActivity"
    android:launchMode="singleTask" />

Answer 4

在AppTheme风格中使用，

Theme.AppCompat.Light.NoActionBar

而不是

Theme.AppCompat.Light.DarkActionBar

您正在设置一个包含操作栏的主题，然后您将工具栏设置为操作栏。这就是您收到此错误的原因。

使用没有操作栏的主题，它将解决问题。

Answer 5

由于您已经拥有Toolbar使用此功能（在您的Styles中）：

Theme.AppCompat.Light.NoActionBar

示例：

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

而且，加上这两个：

<item name="android:windowActionBar">false</item>
    <item name="android:windowNoTitle">true</item>

根据：

此活动已有窗口装饰提供的操作栏。不要请求Window.FEATURE_SUPPORT_ACTION_BAR并设置主题中windowActionBar为false，而不是使用Toolbar。

也许你想在你的OnCreate中尝试这个：

@Override
    public void onClick(View v) {
        switch (v.getId()) {
            case (R.id.boton):
                String dato = editText.getText().toString();
                Toast.makeText(getApplicationContext(), dato, Toast.LENGTH_SHORT).show();
                texto.setText(dato);
                break;
            case (R.id.boton2):
                Intent intent = new Intent(MainActivity.this, secondActivity.class);
                startActivity(intent);
                break;
        }
    }

Answer 6

    The problem is in your Manifest file.

从此更改Manifest xml文件的以下部分; enter code here

    <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
    android:name=".secondActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>'

到此;

<activity android:name=".MainActivity">
<intent-filter>
    <action android:name="android.intent.action.MAIN" />

    <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
    android:name=".secondActivity"
<!--Add the following line to each of your activities in the manifest-->
  android:theme="@style/AppTheme.NoActionBar">
</activity>'

此活动已经有一个操作栏，由Android Studio上的窗口装饰错误提供

6 个答案: