OnClickListener 未检测到点击。 Class 未加载
OnClickListener not detecting click. Class not loading
我是 Android 和 Java 开发的新手。我正在尝试制作一个播放 Icecast 音频流的应用程序。
我发现、复制并编辑了下面的代码到一个名为 Audio Streamclass 的 class
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import java.io.IOException;
public class AudioStream extends Activity implements OnClickListener {
private Button buttonPlay;
private MediaPlayer player;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initializeUIElements();
initializeMediaPlayer();
Log.d("Classloaded", "Class loaded");
}
private void initializeUIElements() {
buttonPlay = findViewById(R.id.PlayPauseButton);
buttonPlay.setOnClickListener(this);
}
public void onClick(View v) {
Log.d("onClick", "On Click worked");
if (v == buttonPlay) {
startPlaying();
}
}
private void startPlaying() {
buttonPlay.setEnabled(false);
player.prepareAsync();
player.setOnPreparedListener(new OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
player.start();
}
});
}
private void initializeMediaPlayer() {
player = new MediaPlayer();
try {
player.setDataSource("streamURL");
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
player.setOnBufferingUpdateListener(new OnBufferingUpdateListener() {
public void onBufferingUpdate(MediaPlayer mp, int percent) {
Log.i("Buffering", "" + percent);
}
});
}
@Override
protected void onPause() {
super.onPause();
if (player.isPlaying()) {
player.stop();
}
}
}
当我 运行 应用程序时,Log.d
事件都没有触发,所以我只能假设 class 从未加载和实例化。所以我在 MainActivity
中添加了以下尝试
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AudioStream stream = new AudioStream();
}
}
我知道我做错了什么。如何在应用程序加载时让 AudioStream
class 实例化,以便 OnClickListener
在我按下播放按钮时起作用?
而不是:
public void onClick(View v) {
Log.d("onClick", "On Click worked");
if (v == buttonPlay) {
startPlaying();
}
}
你应该这样做:
public void onClick(View v) {
Log.d("onClick", "On Click worked");
if (v.getId == R.id.PlayPauseButton) {
startPlaying();
}
}
我是 Android 和 Java 开发的新手。我正在尝试制作一个播放 Icecast 音频流的应用程序。
我发现、复制并编辑了下面的代码到一个名为 Audio Streamclass 的 class
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import java.io.IOException;
public class AudioStream extends Activity implements OnClickListener {
private Button buttonPlay;
private MediaPlayer player;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initializeUIElements();
initializeMediaPlayer();
Log.d("Classloaded", "Class loaded");
}
private void initializeUIElements() {
buttonPlay = findViewById(R.id.PlayPauseButton);
buttonPlay.setOnClickListener(this);
}
public void onClick(View v) {
Log.d("onClick", "On Click worked");
if (v == buttonPlay) {
startPlaying();
}
}
private void startPlaying() {
buttonPlay.setEnabled(false);
player.prepareAsync();
player.setOnPreparedListener(new OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
player.start();
}
});
}
private void initializeMediaPlayer() {
player = new MediaPlayer();
try {
player.setDataSource("streamURL");
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
player.setOnBufferingUpdateListener(new OnBufferingUpdateListener() {
public void onBufferingUpdate(MediaPlayer mp, int percent) {
Log.i("Buffering", "" + percent);
}
});
}
@Override
protected void onPause() {
super.onPause();
if (player.isPlaying()) {
player.stop();
}
}
}
当我 运行 应用程序时,Log.d
事件都没有触发,所以我只能假设 class 从未加载和实例化。所以我在 MainActivity
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AudioStream stream = new AudioStream();
}
}
我知道我做错了什么。如何在应用程序加载时让 AudioStream
class 实例化,以便 OnClickListener
在我按下播放按钮时起作用?
而不是:
public void onClick(View v) {
Log.d("onClick", "On Click worked");
if (v == buttonPlay) {
startPlaying();
}
}
你应该这样做:
public void onClick(View v) {
Log.d("onClick", "On Click worked");
if (v.getId == R.id.PlayPauseButton) {
startPlaying();
}
}