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全部 Android上的真正初學者。我正在編寫一個應用程序，該應用程序顯示全屏jpg，其中包含一個讀取的文件，其中的觸摸區域以20 x 20像素的粒度定義。這些觸摸區域被解碼爲視頻播放。 jpg和觸摸區域解碼工作得很好，直到我將play_video（）註釋掉，那麼模擬器只顯示一個空白屏幕並掛起。可能的視頻編號是0到7，其中8用於指示無效觸摸。添加代碼後，視頻無法啓動並且不再顯示JPEG
我拉我的頭髮剩下的這個。
這裏是Java代碼
package org.example.video_4;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.ImageView;
public class video_4 extends Activity {
byte[] videos_to_play = new byte[960];
boolean video_playing = false;
int video_to_play = 8;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// now display the adBook background screen this is a full screen
// due to the declaration in manifest.xml under activity
// android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
setContentView(R.layout.main);
ImageView jpgView = (ImageView) findViewById(R.id.jpgview);
String myJpgPath = "/sdcard/AdBook.JPG"; //UPDATE WITH YOUR OWN JPG FILE
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 1;
Bitmap bm = BitmapFactory.decodeFile(myJpgPath, options);
jpgView.setImageBitmap(bm);
// now we have to wait for a touch and then fire of the video play
// we also return here when the video is complete so as we wait for
// touch demand for a video to play
set_touch_areas();
/*******************************************************
Problem area all works fine until I uncomment this code
********************************************************/
/* play_video();*/
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int xpos, ypos;
if (event.getAction() != MotionEvent.ACTION_DOWN) {
return super.onTouchEvent(event);
}
xpos = (int) event.getX()/20;
ypos = (int) event.getY()/20;
if (xpos < 0 || xpos > 39 || ypos < 0 || ypos > 23) {
video_to_play = 8;
return true;
}
video_to_play = videos_to_play[(ypos * 40) + xpos];
return true;
}
public void set_touch_areas() {
// read in the touch file
File file = new File("/sdcard/adbook.tch");
FileInputStream is;
int c, v, x;
try {
is = new FileInputStream(file);
// Get the size of the file
long length = file.length();
if (length != 960) {
finish();
}
// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < videos_to_play.length && (numRead = is.read(videos_to_play, offset, videos_to_play.length - offset)) >= 0) {
offset += numRead;
}
// Ensure all the bytes have been read in
if (offset < videos_to_play.length) {
finish();
}
} catch (FileNotFoundException e1) {
// just bomb if anything is bad with the file read
finish();
} catch (IOException e) {
// just bomb if anything is bad with the file read
finish();
}
// we have read the adbook.tch file so now decode the entries based
// on my algorithm of invert, valid & video_num/random data
for (c = 0; c < 960; c++) {
v = (videos_to_play[c] & 0xc0) >> 6; // mask and align the bits for checking
if (v == 0x02) { // inverted and video valid
x = videos_to_play[c]; // java can only invert integer
x = ~x; // so invert an integer, what a pain!!
videos_to_play[c] = (byte)(x & 0x07); // mask to the valid number
} else if (v == 0x01) { // non inverted and video valid
videos_to_play[c] &= (byte) 0x07; // so just isolate the video number
} else { // non valid entry who cares, I do
videos_to_play[c] = (byte) 0x08; // it's not valid so store the fact
}
}
}
public void play_video() {
String myMp4Path = "/sdcard/v1.mp4";
video_to_play = 8;
while (true) {
if ((video_to_play < 8) && (video_playing == false)) {
switch (video_to_play) {
case 0:
myMp4Path = "/sdcard/v0.mp4";
break;
case 1:
myMp4Path = "/sdcard/v1.mp4";
break;
case 2:
myMp4Path = "/sdcard/v2.mp4";
break;
case 3:
myMp4Path = "/sdcard/v3.mp4";
break;
case 4:
myMp4Path = "/sdcard/v4.mp4";
break;
case 5:
myMp4Path = "/sdcard/v5.mp4";
break;
case 6:
myMp4Path = "/sdcard/v6.mp4";
break;
case 7:
myMp4Path = "/sdcard/v7.mp4";
break;
default:
myMp4Path = "/sdcard/v4.mp4";
break;
}
video_playing = true;
MediaPlayer mp = new MediaPlayer();
try {
mp.setDataSource(myMp4Path);
} catch (IllegalArgumentException 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();
}
try {
mp.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mp.start();
while (mp.isPlaying());
video_playing = false;
video_to_play = 8;
}
}
}
}
以供參考：http://stackoverflow.com/editing-help – 2010-12-05 14:54:29
據我所知，你不能在模擬器上播放視頻。你需要有一個設備來測試這個。 – Varun 2010-12-05 15:03:54
當我嘗試使用已知良好的代碼在模擬器上播放視頻時，我沒有得到任何圖片，但音頻確實播放（最終）。 – 2010-12-05 19:14:18