Android的媒体播放器不会使用复选框工作? [英] Android Media player wont work with checkbox?
问题描述
我在后台播放歌曲,并在接下来的页面上一个复选框。当它选中我想要的音乐留在它时,它的选中我希望它留下来了。它的工作原理只是单向的罚款。当我取消了音乐在播放时停止音乐,因为它应该。现在如果我重新启动应用程序的音乐犯规开启这是很好的为好,但是当我去检查的音乐它不回头,直到我回到previous页面。我想一旦它重新测试开始。如果正在播放的音乐,我取消它,它会暂停,如果我检查启动丁字裤,所以我很困惑。
公共类MainActivity延伸活动{
@覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main); MPLAYER = MediaPlayer.create(MainActivity.this,R.raw.roy);
mPlayer.setLooping(真);
负荷preFS()
} @覆盖
公共无效的onDestroy(){
mPlayer.stop();
super.onDestroy();
} 私人无效负荷preFS(){
共享preferences SP = preferenceManager.getDefaultShared preferences(本);
布尔cbValue = sp.getBoolean(复选框,真正的); 如果(cbValue){
mPlayer.start();
}其他{
// 没事做
}
}
}
// ------------------------------------------
公共类下一个扩展活动{
复选框复选框; @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.border);
复选框=(复选框)findViewById(R.id.checkBox1);
负荷preFS();
checkBox.setOnClickListener(新View.OnClickListener(){
@覆盖
公共无效的onClick(视图v){
节省preFS(复选框,checkBox.isChecked());
负荷preFS();
}
});
} 私人无效负荷preFS(){
共享preferences SP = preferenceManager.getDefaultShared preferences(本);
布尔cbValue = sp.getBoolean(复选框,真正的); 如果(cbValue){
checkBox.setChecked(真);
MainActivity.mPlayer.start();
}其他{
checkBox.setChecked(假);
MainActivity.mPlayer.pause();
}
} 私人无效节省preFS(字符串键,布尔值){
共享preferences SP = preferenceManager.getDefaultShared preferences(本);
编辑编辑= sp.edit();
edit.putBoolean(键,值);
edit.commit();
}
}
我不知道有关的两项活动,但是可以在单一的使用情况给予siggestion。其主要思想在这里 - 店不仅是国家播放/暂停,但存储当前播放的位置也和简历 - 只是寻求它。
注意:在情况下,如果你想后台播放,那么你的方法是完全错误的,你需要使用来自的使用与MediaPlayer的服务(我不打算在这里介绍它,因为它是完全不同的,在文档中很好地解释)。
我建议尝试以下code(正常工作对我来说):
公共类MyActivity扩展活动实现CompoundButton.OnCheckedChangeListener {
/** 演奏音乐 */
私人的MediaPlayer MPLAYER = NULL;
/ **开始/暂停音乐* /
私人复选框mSwitch = NULL;
/ **要存储暂停状态* /
私人布尔mIsPlayerPaused = FALSE; / **关键复选框的商店状态* /
私有静态最后弦乐CHECKBOX_KEY =com.example.TestApp.CHECKBOX_KEY;
/ **键保存当前播放位置* /
私有静态最后弦乐PLAY_POSITION_KEY =com.example.TestApp.PLAY_POSITION_KEY; @覆盖
公共无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState); //显示与测试视图布局
的setContentView(R.layout.main); mSwitch =(复选框)findViewById(R.id.checkBox);
} @覆盖
保护无效的onPause(){
super.onPause(); saveState和(); 如果(mPlayer.isPlaying()|| mIsPlayerPaused){
mPlayer.stop();
} mPlayer.release();
MPLAYER = NULL; mSwitch.setOnCheckedChangeListener(NULL);
} @覆盖
保护无效onResume(){
super.onResume(); MPLAYER = MediaPlayer.create(这一点,R.raw.roy);
mPlayer.setLooping(真); 负荷preFS();
mSwitch.setOnCheckedChangeListener(本);
} / **
*负载preferences。集侦听器复选框前应该被调用。
* /
私人无效负荷preFS(){
最后一个共享preferences SP = preferenceManager.getDefaultShared preferences(本);
//获得出场位置
最终诠释位置= sp.getInt(PLAY_POSITION_KEY,0); 如果(位置大于0){
mPlayer.seekTo(位置);
} 最终布尔cbValue = sp.getBoolean(CHECKBOX_KEY,FALSE); 如果(cbValue){
mPlayer.start();
mSwitch.setChecked(真);
}其他{
mIsPlayerPaused = TRUE;
}
} @覆盖
公共无效onCheckedChanged(最终CompoundButton buttonView,最终布尔器isChecked){
如果(器isChecked){
如果(!mPlayer.isPlaying()){
mPlayer.start();
}
}其他{
mPlayer.pause();
mIsPlayerPaused = TRUE;
}
} / **
*保存当前的播放状态。
* /
私人无效saveState和(){
最后一个共享preferences SP = preferenceManager.getDefaultShared preferences(本);
最后一个共享preferences.Editor编辑= sp.edit(); edit.putBoolean(CHECKBOX_KEY,mSwitch.isChecked()); 如果(MPLAYER = NULL&放大器;!及(mPlayer.isPlaying()|| mIsPlayerPaused)){
edit.putInt(PLAY_POSITION_KEY,mPlayer.getCurrentPosition());
}其他{
edit.putInt(PLAY_POSITION_KEY,0);
} edit.commit();
}
}
I have a song playing in the background, and on the next page is a check box. When it's checked I want the music to stay on and it when it's unchecked I want it to stay off. It works fine except for one way. When I uncheck the music while playing it stops the music as it should. now if I restart the app the music doesnt turn on which is good as well, but when I go to check music it doesnt turn back on until I go back to the previous page. i want to to start once it's rechecked. If the music is playing and I uncheck it, it pauses, and if I check it it starts t back up so I am confused.
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPlayer = MediaPlayer.create(MainActivity.this, R.raw.roy);
mPlayer.setLooping(true);
loadPrefs()
}
@Override
public void onDestroy() {
mPlayer.stop();
super.onDestroy();
}
private void loadPrefs() {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
boolean cbValue = sp.getBoolean("CHECKBOX",true);
if(cbValue) {
mPlayer.start();
} else {
// nothing to do
}
}
}
//------------------------------------------
public class next extends Activity {
CheckBox checkBox;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.border);
checkBox = (CheckBox) findViewById(R.id.checkBox1);
loadPrefs();
checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
savePrefs("CHECKBOX",checkBox.isChecked());
loadPrefs();
}
});
}
private void loadPrefs() {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
boolean cbValue = sp.getBoolean("CHECKBOX",true);
if(cbValue) {
checkBox.setChecked(true);
MainActivity.mPlayer.start();
} else {
checkBox.setChecked(false);
MainActivity.mPlayer.pause();
}
}
private void savePrefs(String key, Boolean value) {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
Editor edit = sp.edit();
edit.putBoolean(key, value);
edit.commit();
}
}
I'm not sure about two activities, but could give siggestion in case of usage of single one. The main idea here - store not only state play / pause, but store current playing position also and on resume - just seek to it.
NOTE: In case if You want background play, then your way is completely wrong and You need to rework it using suggestions from "Using a Service with MediaPlayer" (I'm not going to cover it here, because it's completely different and well explained in the documentation).
I would suggest to try the following code (it works fine for me):
public class MyActivity extends Activity implements CompoundButton.OnCheckedChangeListener {
/** To play music */
private MediaPlayer mPlayer = null;
/** To start / pause music */
private CheckBox mSwitch = null;
/** To store paused state */
private boolean mIsPlayerPaused = false;
/** Key to store state of checkbox */
private static final String CHECKBOX_KEY = "com.example.TestApp.CHECKBOX_KEY";
/** Key to store current play position */
private static final String PLAY_POSITION_KEY = "com.example.TestApp.PLAY_POSITION_KEY";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Show the layout with the test view
setContentView(R.layout.main);
mSwitch = (CheckBox) findViewById(R.id.checkBox);
}
@Override
protected void onPause() {
super.onPause();
saveState();
if (mPlayer.isPlaying() || mIsPlayerPaused) {
mPlayer.stop();
}
mPlayer.release();
mPlayer = null;
mSwitch.setOnCheckedChangeListener(null);
}
@Override
protected void onResume() {
super.onResume();
mPlayer = MediaPlayer.create(this, R.raw.roy);
mPlayer.setLooping(true);
loadPrefs();
mSwitch.setOnCheckedChangeListener(this);
}
/**
* Loads preferences. Should be called before set listener to CheckBox.
*/
private void loadPrefs() {
final SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
// get played position
final int position = sp.getInt(PLAY_POSITION_KEY, 0);
if (position > 0) {
mPlayer.seekTo(position);
}
final boolean cbValue = sp.getBoolean(CHECKBOX_KEY, false);
if (cbValue) {
mPlayer.start();
mSwitch.setChecked(true);
} else {
mIsPlayerPaused = true;
}
}
@Override
public void onCheckedChanged(final CompoundButton buttonView, final boolean isChecked) {
if (isChecked) {
if (!mPlayer.isPlaying()) {
mPlayer.start();
}
} else {
mPlayer.pause();
mIsPlayerPaused = true;
}
}
/**
* Saves current playback state.
*/
private void saveState() {
final SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
final SharedPreferences.Editor edit = sp.edit();
edit.putBoolean(CHECKBOX_KEY, mSwitch.isChecked());
if (mPlayer != null && (mPlayer.isPlaying() || mIsPlayerPaused)) {
edit.putInt(PLAY_POSITION_KEY, mPlayer.getCurrentPosition());
} else {
edit.putInt(PLAY_POSITION_KEY, 0);
}
edit.commit();
}
}
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