Android模拟器无法运行应用程序

Question

我用youtube视图和东西制作一个简单的应用程序，但每当我运行应用程序时，我没有错误，但应用程序没有打开，在我的模拟器上它说“CFBC（我的应用程序的名称）已停止运行”这里是我的代码我有6个活动，我知道它很多，但如果有人能告诉我为什么它崩溃0错误将有助于一吨

package org.cfbcla.cfbc;


import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubePlayer;
import com.google.android.youtube.player.YouTubePlayerView;

import java.util.ArrayList;
import java.util.List;


/**
 * Created by kwia on 8/4/17.
 */

public class Display extends AppCompatActivity {
    YouTubePlayerView mYouTubePlayerView;
    Button btnPlay;
    YouTubePlayer.OnInitializedListener mOnInitializedListener;



    @Override
    public void onBackPressed() {

}

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.display);
        btnPlay = (Button) findViewById(R.id.btnPlay);
        mYouTubePlayerView = (YouTubePlayerView) findViewById(R.id.youtubePlay);

        mOnInitializedListener = new YouTubePlayer.OnInitializedListener() {
            @Override
            public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {
                List<String> videoList = new ArrayList<>();
                videoList.add("QOwE0XQei_M");
                videoList.add("5sTXWESDBB0");
                youTubePlayer.loadVideos(videoList);



            }

            @Override
            public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {

            }
        };
        btnPlay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mYouTubePlayerView.initialize(YTConfig.getApiKey(), mOnInitializedListener);

            }
        });



    }


    public void onButtonclick4(View v4) {
        if (v4.getId() == R.id.button3) {
            Intent i4 = new Intent(Display.this, MainActivity.class);
            startActivity(i4);
        }
    }
}

package org.cfbcla.cfbc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

/**
 * Created by kwia on 8/4/17.
 */

public class Display2 extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.display2);
    }
    public void onButtonclick4(View v4) {
        if (v4.getId() == R.id.button) {
            Intent i4 = new Intent(Display2.this, MainActivity.class);
            startActivity(i4);
        }
    }
}

package org.cfbcla.cfbc;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubePlayer;
import com.google.android.youtube.player.YouTubePlayerView;


/**
 * Created by kwia on 8/4/17.
 */

public class Display3 extends AppCompatActivity{
    YouTubePlayerView mYouTubePlayerView;
    Button btnPlay;
    YouTubePlayer.OnInitializedListener mOnInitializedListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.display3);
        btnPlay = (Button) findViewById(R.id.btnPlay);
        mYouTubePlayerView = (YouTubePlayerView) findViewById(R.id.youtubePlay);

        mOnInitializedListener = new YouTubePlayer.OnInitializedListener() {
            @Override
            public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {
                youTubePlayer.loadVideo("sFXQ1vAaKXA");



            }

            @Override
            public void onInitializationFailure(YouTubePlayer.Provider provider, YouTubeInitializationResult youTubeInitializationResult) {

            }
        };
        btnPlay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mYouTubePlayerView.initialize(YTConfig.getApiKey(), mOnInitializedListener);

            }
        });



    }
    public void onButtonclick4(View v4) {
        if (v4.getId() == R.id.button) {
            Intent i4 = new Intent(Display3.this, MainActivity.class);
            startActivity(i4);
        }
    }
}

package org.cfbcla.cfbc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

/**
 * Created by kwia on 8/4/17.
 */

public class Display4 extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.display4);
    }
    public void onButtonclick4(View v4) {
        if (v4.getId() == R.id.button4) {
            Intent i4 = new Intent(Display4.this, MainActivity.class);
            startActivity(i4);
        }
    }
}

package org.cfbcla.cfbc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {

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

    }

    public void onButtonClick(View v) {
        if (v.getId() == R.id.A) {
            Intent i = new Intent(MainActivity.this, Display.class);
            startActivity(i);
        }

    }

    public void onButtonClick2(View v2) {
        if (v2.getId() == R.id.C) {
            Intent i2 = new Intent(MainActivity.this, Display2.class);
            startActivity(i2);
        }
    }
    public void onbuttonClick3(View v3) {
        if (v3.getId() == R.id.S) {
            Intent i3 = new Intent(MainActivity.this, Display3.class);
            startActivity(i3);
        }
    }
    public void onButtonclick4(View v4) {
        if (v4.getId() == R.id.M) {
            Intent i4 = new Intent(MainActivity.this, Display4.class);
            startActivity(i4);
        }
    }

}