Question

我正在关注newboston的教程（Android应用程序开发），但我运行的应用程序在运行一个类（启动）文件后崩溃了。

在启动类之后，菜单类将运行，然后是MainActivity，然后是textplay ..

我正在为所有课程编写代码。看看你能否找到错误的地方

Splash class

 package com.example.testing;

 import android.app.Activity;
 import android.content.Intent;
 import android.media.MediaPlayer;
 import android.os.Bundle;

public class Splash extends Activity {
    MediaPlayer ourSong;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.splash);
        ourSong = MediaPlayer.create(Splash.this,R.raw.sound);
        ourSong.start();
        Thread timer=new Thread(){
        public void run(){
            try{
                sleep(5000);
                }catch(InterruptedException e){
                    e.printStackTrace();
                }finally{
                    Intent openStartingPoint=
                              new Intent("com.example.testing.Menu");

                    startActivity(openStartingPoint);
                }
                    }
    };timer.start();
}
    protected void onPause(){
                super.onPause();
                ourSong.release();
                finish();
                }
}

菜单类

package com.example.testing;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class Menu extends ListActivity {

    String classes[]={"MainActivity","TextPlay","example2","example3","example4","example5"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setListAdapter(new ArrayAdapter<String>(Menu.this,android.R.layout.simple_list_item_1,classes));
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(l, v, position, id);
        String cheese=classes[position];
        try {
             Class ourClass = Class.forName("com.example.testing."+ cheese);
            Intent ourIntent=new Intent(Menu.this , ourClass);
            startActivity(ourIntent);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }





}

MainActivity Class

package com.example.testing;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

int counter;
Button add,sub;
TextView display;

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

            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;
}

}

TextPlay Class

package com.example.testing;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.ToggleButton;

public class TextPlay extends Activity{

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

        Button chkCmd = (Button) findViewById (R.id.bResults);
        final ToggleButton passTog = (ToggleButton) findViewById (R.id.tbPassword);
        EditText input =(EditText) findViewById (R.id.etCommands);
        TextView display = (TextView) findViewById (R.id.tvResults);
        passTog.setOnClickListener(new View.OnClickListener() {


            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                if(passTog.isChecked()){

                }
                else{
                    }
                }
        });
    }



}

Answer 1

 Intent openStartingPoint=new Intent("com.example.testing.Menu");

而不是使用 -

 Intent openStartingPoint=new Intent(Splash.this,Menu.class);

希望这有帮助。

Answer 2

试试这个..

可能会在android.content.ActivityNotFoundException Intent openStartingPoint=new Intent("com.example.testing.Menu"); finally{ Intent openStartingPoint=new Intent(Splash.this,Menu.class); startActivity(openStartingPoint); }更改您的最终，如下所示

{{1}}

“Android应用程序”已停止

2 个答案: