Android应用程序崩溃-未知原因[重复]

Question

我是初学者，一直在使用树屋学习。我在课程中很早，当我启动应用程序时突然开始收到崩溃消息。我不确定发生了什么。我已经发布了我所知道的一切。抱歉，如果我错过了什么或发布了太多内容。

主要：

package com.example.crystalball;

import android.R.string;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {
private CrystalBall mCrystalBall = new CrystalBall();
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Declare our View variables
    final TextView answerLabel = (TextView) findViewById(R.id.textView1);
    Button getAnswerButton = (Button) findViewById(R.id.button1);

    getAnswerButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            String answer = mCrystalBall.getAnAnswer();

            // Update label with dynamic answer
            answerLabel.setText(answer);
        }
    });
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

}

水晶球：

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

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="19" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" >
    <activity
        android:name="com.example.crystalball.MainActivity"
        android:label="@string/app_name" android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

Android 清单：

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

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="19" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" >
    <activity
        android:name="com.example.crystalball.MainActivity"
        android:label="@string/app_name" android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

Logcat：

07-28 01:50:31.530: D/AndroidRuntime(980): Shutting down VM
07-28 01:50:31.530: W/dalvikvm(980): threadid=1: thread exiting with uncaught exception (group=0xb1ae7ba8)
07-28 01:50:31.570: E/AndroidRuntime(980): FATAL EXCEPTION: main
07-28 01:50:31.570: E/AndroidRuntime(980): Process: com.example.crystalball, PID: 980
07-28 01:50:31.570: E/AndroidRuntime(980): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.crystalball/com.example.crystalball.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.os.Handler.dispatchMessage(Handler.java:102)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.os.Looper.loop(Looper.java:136)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.app.ActivityThread.main(ActivityThread.java:5017)
07-28 01:50:31.570: E/AndroidRuntime(980):  at java.lang.reflect.Method.invokeNative(Native Method)
07-28 01:50:31.570: E/AndroidRuntime(980):  at java.lang.reflect.Method.invoke(Method.java:515)
07-28 01:50:31.570: E/AndroidRuntime(980):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-28 01:50:31.570: E/AndroidRuntime(980):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-28 01:50:31.570: E/AndroidRuntime(980):  at dalvik.system.NativeStart.main(Native Method)
07-28 01:50:31.570: E/AndroidRuntime(980): Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:111)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:58)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
07-28 01:50:31.570: E/AndroidRuntime(980):  at com.example.crystalball.MainActivity.onCreate(MainActivity.java:16)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.app.Activity.performCreate(Activity.java:5231)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-28 01:50:31.570: E/AndroidRuntime(980):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
07-28 01:50:31.570: E/AndroidRuntime(980):  ... 11 more
07-28 01:50:37.070: I/Process(980): Sending signal. PID: 980 SIG: 9

Answer 1

您的活动扩展ActionBarActivity。

public class MainActivity extends ActionBarActivity

表示您正在使用AppCompat，在这种情况下，您需要将派生自Theme.AppCompat 的Theme 设置为活动

或

android:theme="@style/Theme.AppCompat" >

为应用设置主题

Answer 2

要简单地添加 ActionBar Compat，您的活动或应用程序应在 AndroidManifest.xml 中使用 @style/Theme.AppCompat 主题，如下所示：

   <activity
        ...
        android:theme="@style/Theme.AppCompat" />

这将在 activty 中添加操作栏（如果您将此主题添加到应用程序，则将添加所有活动）

即在您的清单文件中，更改

android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" 

到

android:theme="@style/Theme.AppCompat"

Answer 3

请更改

 android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" 

到

 android:theme="@android:style/Theme.AppCompat"