我有无线电应用流，当打开此应用时，首先打开它的开放式布局：
splash.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:src="@drawable/loading" />
<ProgressBar
android:id="@+id/progressBar1"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.67" />
</LinearLayout>
和它类似：
StartPoint.java
public class StartPoint extends Activity{
ProgressBar progressBar;
private int progressBarStatus = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
progressBar = (ProgressBar)findViewById(R.id.progressBar1);
Thread timer = new Thread(){
public void run(){
try{
sleep(5000);
while(progressBarStatus < 5000){
StartPoint.this.runOnUiThread(new Runnable(){
public void run()
{
progressBar.setProgress(progressBarStatus);
progressBarStatus += 1000;
}
});
}
}catch(InterruptedException e){
e.printStackTrace();
}finally{
Intent openMainList = new Intent(StartPoint.this,
com.example.kam.MainActivity.class);
startActivity(openMainList);
}
}
};
timer.start();
}
@Override
protected void onStop(){
super.onStop();
finish();
}
}
这个类完成后，它调用MainActivity.java类，并显示它：
MainActivity.java
public class MainActivity extends Activity implements OnClickListener {
// Define ..............................................................
private static ProgressDialog progressDialog;
public MediaPlayer mp;
boolean isPrepared = false;
Button PlayBtn, ExitBtn, PauseBtn, RefreshBtn;
String MEDIA_PATH;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressDialog = ProgressDialog.show(MainActivity.this, "",
"Buffering Radio...", true);
progressDialog.setCancelable(false);
// Declare
// ..............................................................
mp = new MediaPlayer();
PlayBtn = (Button) findViewById(R.id.btnPlay);
PlayBtn.setOnClickListener(this);
PauseBtn = (Button) findViewById(R.id.btnPause);
PauseBtn.setOnClickListener(this);
RefreshBtn = (Button) findViewById(R.id.btnRefresh);
RefreshBtn.setOnClickListener(this);
ExitBtn = (Button) findViewById(R.id.btnExit);
ExitBtn.setOnClickListener(this);
MEDIA_PATH = "http://radio.arabhosters.com:8015/";
// Volume Control
// ..............................................................
final AudioManager leftAm = (AudioManager)
getSystemService(Context.AUDIO_SERVICE);
int maxVolume = leftAm.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
int curVolume = leftAm.getStreamVolume(AudioManager.STREAM_MUSIC);
SeekBar volControl = (SeekBar) findViewById(R.id.volumebar);
volControl.setMax(maxVolume);
volControl.setProgress(curVolume);
volControl.setOnSeekBarChangeListener
(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar arg0) {
// TODO Auto-generated method stub
}
@Override
public void onStartTrackingTouch(SeekBar arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged
(SeekBar arg0, int arg1, boolean arg2) {
// TODO Auto-generated method stub
leftAm.setStreamVolume(AudioManager.STREAM_MUSIC, arg1, 0);
}
});
}
@Override
public void onClick(View v) {
if (v == PlayBtn) {
startradio();
}
else if (v == PauseBtn) {
pauseradio();
}
else if (v == ExitBtn) {
exitradio();
}
else if (v == RefreshBtn) {
try {
refreshradio();
}
catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void onCompletion(MediaPlayer mediaPlayer) {
synchronized (this) {
isPrepared = false;
}
}
protected void onResume() {
super.onResume();
try {
mp.setDataSource(MEDIA_PATH);
}
catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mp.prepare();
}
catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} // also consider mp.prepareAsync().
// defult start stream when start App.
mp.start();
mp.setVolume(100, 100);
progressDialog.dismiss();
}
// method for play stream after stop it.
public void startradio() {
try {
if (mp.isPlaying()) {
return;
}
mp.start();
progressDialog.dismiss();
}
catch (IllegalStateException ex) {
ex.printStackTrace();
}
}
// method for Refresh stream.
public void refreshradio() throws IllegalArgumentException,
SecurityException, IOException {
try {
if (mp.isPlaying()) {
return;
}
mp.reset();
mp.setDataSource(MEDIA_PATH);
mp.prepare();
mp.start();
progressDialog.dismiss();
}
catch (IllegalStateException ex) {
ex.printStackTrace();
}
}
// method for pause stream.
public void pauseradio() {
mp.pause();
}
// method for check is radio paly or not stream
public boolean isPlaying() {
return mp.isPlaying();
}
// method for Looping audio if your record it - Soon :)
public boolean isLooping() {
return mp.isLooping();
}
// method for Looping audio if your record it - Soon :)
public void setLooping(boolean isLooping) {
mp.setLooping(isLooping);
}
// method for volume
public void setVolume(float volumeLeft, float volumeRight) {
mp.setVolume(volumeLeft, volumeRight);
}
// method for stop stream.
public void stopradio() {
if (mp.isPlaying()) {
mp.stop();
}
mp.release();
}
// method for exit.
public void exitradio() {
finish();
System.exit(0);
}
// method for back to main menu "Home".
public void backtomenu() {
finish();
}
@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;
}
}
和它的布局如：
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/screen"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:orientation="vertical"
>
<LinearLayout
android:layout_weight="6"
android:orientation="vertical"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_width="fill_parent"
android:layout_height="0dip" >
</LinearLayout>
<LinearLayout
android:id="@+id/buttons"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_alignParentLeft="true"
android:layout_weight="0.62"
android:background="@drawable/iconbgrepate"
android:gravity="center"
android:orientation="horizontal"
android:tileMode="repeat"
android:weightSum="5"
android:alpha=".75">
<SeekBar
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/volumebar"
android:max="100"
android:paddingBottom="10dip"/>
</LinearLayout>
<LinearLayout
android:id="@+id/buttons"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_alignParentLeft="true"
android:layout_weight="0.62"
android:background="@drawable/iconbgrepate"
android:gravity="center"
android:orientation="horizontal"
android:tileMode="repeat"
android:weightSum="5" >
<Button
android:id="@+id/btnRefresh"
android:layout_width="32dp"
android:layout_height="match_parent"
android:layout_margin="5dp"
android:layout_weight="0.10"
android:background="@drawable/refreshbutton" />
<View android:layout_weight="1"
android:layout_width="0dip"
android:layout_height="0dip" />
<Button
android:id="@+id/btnPause"
android:layout_width="32dp"
android:layout_height="match_parent"
android:layout_margin="5dp"
android:layout_weight="0.05"
android:background="@drawable/pausebutton" />
<View android:layout_weight="1"
android:layout_width="0dip"
android:layout_height="0dip" />
<Button
android:id="@+id/btnPlay"
android:layout_width="32dp"
android:layout_height="match_parent"
android:layout_margin="5dp"
android:layout_weight="0.05"
android:background="@drawable/playbutton" />
<View android:layout_weight="1"
android:layout_width="0dip"
android:layout_height="0dip" />
<Button
android:id="@+id/btnExit"
android:layout_width="32dp"
android:layout_height="match_parent"
android:layout_margin="5dp"
android:layout_weight="0.12"
android:background="@drawable/exitbutton" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>
为什么从splash.xml到activity_main.xml的转换显示黑色背景几分钟并显示应用。
答案 0 :(得分：0)
由于你正在改变活动，它会像你说的那样显示一些动画或黑屏。它是默认行为。您可以在主活动之上使用带有初始布局的自定义对话框。您可以触发对话框以完成进度关闭。使用两个活动可以产生其他效果。例如，当用户点击后退按钮时，它将返回启动画面而不是退出应用程序。
答案 1 :(得分：0)
试试吧
Thread timer = new Thread(){
public void run(){
try{
while(progressBarStatus < 5000){
StartPoint.this.runOnUiThread(new Runnable(){
public void run()
{
progressBar.setProgress(progressBarStatus);
progressBarStatus += 1000;
}
});
sleep(5000);
}