我遵循了几个教程，我发现这个错误没有解决。这是我的代码。每次我在2秒后运行时，我的应用程序都会意外停止（预先设置的定时器）

错误是：应用程序测试（process com. juical.test）意外停止。请重试。它在AVD上提示。

W/dalvikvm（281）： sureadid=7：线程退出且未捕获异常（组=0x4001d800）

E/AndroidRuntime（281）：致命例外：Thread-8

E/AndroidRuntime（281）： android.content.ActivityNotFoundException：找不到处理Intent{act=com.juical.test.MAINACTIVITY}的活动

E/AndroidRuntime（281）：android.app. Instrumentation.checkStartActivityResult（Instrumentation.java:1408）

E/AndroidRuntime（281）：android.app. Instrumentation.expStartActivity（Instrumentation.java:1378）

E/AndroidRuntime（281）：android.app. Activity.start ActivityForResult（Activity.java:2817）

E/AndroidRuntime（281）：android.app. Activity.start Activity（Activity.java:2923）

E/AndroidRuntime（281）：在com. juical.test.Tree$1.run（Tree.java:24）**

树. xml

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.tree);

    Thread timer = new Thread(){
        public void run(){
            try{
                sleep(2000);
            }catch(InterruptedException e){
                e.printStackTrace();
            }
            finally{
                Intent openMainActivity = new Intent("com.juicy.test.MAINACTIVITY");
                startActivity(openMainActivity);
            }
        }
    };
    timer.start();

AndroidManifest. xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.juicy.test"
    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=".Tree"
            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=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="com.juicy.test.MAINACTIVITY" />

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

</manifest>

MainActivity.java

package com.juicy.test;


import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
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 {

    int counter;
    Button add, sub;
    TextView display;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        counter = 0;
        add = (Button) findViewById(R.id.bAdd);
        sub = (Button) findViewById(R.id.bSub);
        display = (TextView) findViewById(R.id.tvDisplay);

        add.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                counter++;
                display.setText("Your total is " + counter);
            }
        });
        sub.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                counter--;
                display.setText("Your total is " + counter);

            }
        });
    }


    @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);
    }
}