原因：java.lang.NoSuchFieldError:android.support.v7.appcompat

使用此代码：

package com.example.newsapp;

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.Toast;

public class MainActivity extends ActionBarActivity {

    private Button mTrueButton;
    private Button mFalseButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            mTrueButton = (Button)findViewById(R.id.true_button);
            mTrueButton.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                            Toast.makeText(MainActivity.this,
                                            R.string.correct_toast,
                                            Toast.LENGTH_SHORT).show();


                    }
            });
            mFalseButton = (Button)findViewById(R.id.true_button);
            mFalseButton.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                            Toast.makeText(MainActivity.this,
                                            R.string.incorret_toast,
                                            Toast.LENGTH_SHORT).show();


                    }
            });
    }

    @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);


    }

}

这个XML：

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

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

</manifest>

我得到了以下错误：

12-28 16:10:43.777: I/dalvikvm(13310): Could not find method android.view.ViewGroup.onNestedScrollAccepted, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.onNestedScrollAccepted
12-28 16:10:43.777: W/dalvikvm(13310): VFY: unable to resolve virtual method 11426: Landroid/view/ViewGroup;.onNestedScrollAccepted (Landroid/view/View;Landroid/view/View;I)V
12-28 16:10:43.777: D/dalvikvm(13310): VFY: replacing opcode 0x6f at 0x0000
12-28 16:10:43.777: I/dalvikvm(13310): Could not find method android.view.ViewGroup.onStopNestedScroll, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.onStopNestedScroll
12-28 16:10:43.777: W/dalvikvm(13310): VFY: unable to resolve virtual method 11432: Landroid/view/ViewGroup;.onStopNestedScroll (Landroid/view/View;)V
12-28 16:10:43.777: D/dalvikvm(13310): VFY: replacing opcode 0x6f at 0x0000
12-28 16:10:43.777: I/dalvikvm(13310): Could not find method android.support.v7.internal.widget.ActionBarOverlayLayout.stopNestedScroll, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.setHideOnContentScrollEnabled
12-28 16:10:43.777: W/dalvikvm(13310): VFY: unable to resolve virtual method 9005: Landroid/support/v7/internal/widget/ActionBarOverlayLayout;.stopNestedScroll ()V
12-28 16:10:43.777: D/dalvikvm(13310): VFY: replacing opcode 0x6e at 0x000e
12-28 16:10:43.787: D/dalvikvm(13310): DexOpt: couldn't find static field Landroid/support/v7/appcompat/R$styleable;.Toolbar_buttonGravity
12-28 16:10:43.787: W/dalvikvm(13310): VFY: unable to resolve static field 3142 (Toolbar_buttonGravity) in Landroid/support/v7/appcompat/R$styleable;
12-28 16:10:43.787: D/dalvikvm(13310): VFY: replacing opcode 0x60 at 0x00aa
12-28 16:10:43.817: I/dalvikvm(13310): Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
12-28 16:10:43.817: W/dalvikvm(13310): VFY: unable to resolve virtual method 364: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
12-28 16:10:43.817: D/dalvikvm(13310): VFY: replacing opcode 0x6e at 0x0002
12-28 16:10:43.817: I/dalvikvm(13310): Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
12-28 16:10:43.817: W/dalvikvm(13310): VFY: unable to resolve virtual method 386: Landroid/content/res/TypedArray;.getType (I)I
12-28 16:10:43.817: D/dalvikvm(13310): VFY: replacing opcode 0x6e at 0x0002
12-28 16:10:43.827: D/AndroidRuntime(13310): Shutting down VM
12-28 16:10:43.827: W/dalvikvm(13310): threadid=1: thread exiting with uncaught exception (group=0x418eeda0)
12-28 16:10:43.827: E/AndroidRuntime(13310): FATAL EXCEPTION: main
12-28 16:10:43.827: E/AndroidRuntime(13310): Process: com.example.newsapp, PID: 13310
12-28 16:10:43.827: E/AndroidRuntime(13310): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.newsapp/com.example.newsapp.MainActivity}: android.view.InflateException: Binary XML file line #36: Error inflating class android.support.v7.widget.Toolbar
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.app.ActivityThread.access$900(ActivityThread.java:161)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.os.Handler.dispatchMessage(Handler.java:102)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.os.Looper.loop(Looper.java:157)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.app.ActivityThread.main(ActivityThread.java:5356)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at java.lang.reflect.Method.invokeNative(Native Method)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at java.lang.reflect.Method.invoke(Method.java:515)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at dalvik.system.NativeStart.main(Native Method)
12-28 16:10:43.827: E/AndroidRuntime(13310): Caused by: android.view.InflateException: Binary XML file line #36: Error inflating class android.support.v7.widget.Toolbar
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.view.LayoutInflater.createView(LayoutInflater.java:626)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:702)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:769)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.support.v7.app.ActionBarActivityDelegateBase.ensureSubDecor(ActionBarActivityDelegateBase.java:273)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:225)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at com.example.newsapp.MainActivity.onCreate(MainActivity.java:18)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.app.Activity.performCreate(Activity.java:5426)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
12-28 16:10:43.827: E/AndroidRuntime(13310):    ... 11 more
12-28 16:10:43.827: E/AndroidRuntime(13310): Caused by: java.lang.reflect.InvocationTargetException
12-28 16:10:43.827: E/AndroidRuntime(13310):    at java.lang.reflect.Constructor.constructNative(Native Method)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.view.LayoutInflater.createView(LayoutInflater.java:600)
12-28 16:10:43.827: E/AndroidRuntime(13310):    ... 24 more
12-28 16:10:43.827: E/AndroidRuntime(13310): Caused by: java.lang.NoSuchFieldError: android.support.v7.appcompat.R$styleable.Toolbar_buttonGravity
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.support.v7.widget.Toolbar.<init>(Toolbar.java:203)
12-28 16:10:43.827: E/AndroidRuntime(13310):    at android.support.v7.widget.Toolbar.<init>(Toolbar.java:190)
12-28 16:10:43.827: E/AndroidRuntime(13310):    ... 27 more

12-28 16:10:43.777:I/dalvikvm（13310）：找不到方法android.view.ViewGroup.onnestedScrolAccepted，从方法android.support.v7.internal.widget.ActionBarOverlayLayout.onnestedScrolAccepted引用
12-28 16:10:43.777:W/dalvikvm（13310）：VFY:无法解析虚拟方法11426:Landroid/view/ViewGroup；。ONNESTEDSCROLACCEPTED（Landroid/视图/视图；Landroid/视图/视图；I）V
12-28 16:10:43.777:D/dalvikvm（13310）：VFY：在0x0000处替换操作码0x6f
12-28 16:10:43.777:I/dalvikvm（13310）：找不到方法android.view.ViewGroup.onStopNestedScroll，该方法引用自方法android.support.v7.internal.widget.ActionBarOverlayLayout.onStopNestedScroll
12-28 16:10:43.777:W/dalvikvm（13310）：VFY:无法解析虚拟方法11432:Landroid/view/ViewGroup；。onStopNestedScroll（Landroid/view/view；）V
12-28 16:10:43.777:D/dalvikvm（13310）：VFY：在0x0000处替换操作码0x6f
12-28 16:10:43.777:I/dalvikvm（13310）：找不到方法android.support.v7.internal.widget.ActionBarOverlayLayout.stopNestedScroll，该方法引用自方法android.support.v7.internal.widget.ActionBaroverLayout.setHideOnContentScrollEnabled
12-28 16:10:43.777:W/dalvikvm（13310）：VFY:无法解析虚拟方法9005:Landroid/support/v7/internal/widget/ActionBarOverlayLayout；。stopNestedScroll（）V
12-28 16:10:43.777:D/dalvikvm（13310）：VFY：在0x000e处替换操作码0x6e
12-28 16:10:43.787:D/dalvikvm（13310）：DexOpt:找不到静态字段Landroid/support/v7/appcompat/R$styleable；。工具栏按钮重力
12-28 16:10:43.787:W/dalvikvm（13310）：VFY：无法解析Landroid/support/v7/appcompat/R$styleable中的静态字段3142（工具栏按钮重力）；
12-28 16:10:43.787:D/dalvikvm（13310）：VFY：在0x00aa处替换操作码0x60
12-28 16:10:43.817:I/dalvikvm（13310）：找不到方法android.content.res.TypedArray.getChangingConfigurations，该方法引用自方法android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
12-28 16:10:43.817:W/dalvikvm（13310）：VFY:无法解析虚拟方法364:Landroid/content/res/TypedArray；。getChangingConfigurations（）I
12-28 16:10:43.817:D/dalvikvm（13310）：VFY：在0x0002处替换操作码0x6e
12-28 16:10:43.817:I/dalvikvm（13310）：找不到从方法android.support.v7.internal.widget.TintTypedArray.getType引用的方法android.content.res.TypedArray.getType
12-28 16:10:43.817:W/dalvikvm（13310）：VFY:无法解析虚拟方法386:Landroid/content/res/TypedArray；。getType（I）I
12-28 16:10:43.817:D/dalvikvm（13310）：VFY：在0x0002处替换操作码0x6e
12-28 16:10:43.827:D/AndroidRuntime（13310）：关闭虚拟机
12-28 16:10:43.827:W/dalvikvm（13310）：threadid=1:线程退出时出现未捕获异常（组=0x418eeda0）
12-28 16:10:43.827:E/AndroidRuntime（13310）：致命异常：main
12-28 16:10:43.827:E/AndroidRuntime（13310）：进程：com.example.newsapp，PID:13310
12-28 16:10:43.827:E/AndroidRuntime（13310）：java.lang.RuntimeException:无法启动活动组件信息{com.example.newsapp/com.example.newsapp.MainActivity}:android.view.InflateException:二进制XML文件行#36:膨胀类android.support.v7.widget.Toolbar时出错
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2305）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2363）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.app.ActivityThread.access$900（ActivityThread.java:161）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1265）
12-28 16:10:43.827:E/AndroidRuntime（13310）：位于android.os.Handler.dispatchMessage（Handler.java:102）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.os.Looper.loop（Looper.java:157）上
12-28 16:10:43.827:E/AndroidRuntime（13310）：位于android.app.ActivityThread.main（ActivityThread.java:5356）
12-28 16:10:43.827:E/AndroidRuntime（13310）：位于java.lang.reflect.Method.Invokenactive（本机方法）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在java.lang.reflect.Method.invoke（Method.java:515）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:1265）
12-28 16:10:43.827:E/AndroidRuntime（13310）：位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1081）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在dalvik.system.NativeStart.main（本机方法）
12-28 16:10:43.827:E/AndroidRuntime（13310）：由以下原因引起：android.view.InflateException:二进制XML文件行#36:对类android.support.v7.widget.Toolbar进行膨胀时出错
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.view.LayoutInflater.createView（LayoutInflater.java:626）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.view.LayoutInflater.createViewFromTag（LayoutInflater.java:702）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.view.LayoutInflater.rInflate（LayoutInflater.java:761）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.view.LayoutInflater.rInflate（LayoutInflater.java:769）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.view.LayoutInflater.inflate（LayoutInflater.java:498）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.view.LayoutInflater.inflate（LayoutInflater.java:398）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.view.LayoutInflater.inflate（LayoutInflater.java:354）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.support.v7.app.ActionBarActivityDelegateBase.ensureSubDecor（ActionBarActivityDelegateBase.java:273）
12-28 16:10:43.827:E/AndroidRuntime（13310）：在android.support.v7.app.ActionBarActivityDelegateBase.setContentView
mvn install:install-file -Dfile=/path/to/sdk/extras/android/compatibility/v7/appcompat/libs/android-support-v7-appcompat.jar -DgroupId=com.google.android -DartifactId=support-v7-appcompat -Dversion=r21 -Dpackaging=jar

<dependency>
   <groupId>com.google.android</groupId>
   <artifactId>support-v7-appcompat</artifactId>
   <version>r21</version>
   <type>jar</type>
   <scope>compile</scope>
</dependency>