您好我创建了一个媒体播放器。当我的媒体播放器应用程序加载那个时间我的对话框也首次显示....但现在我只期望加载我的对话框..如果我在新设备中运行第一次我的应用程序打开对话框否则只显示视频缩略图。 .....我很困惑请帮帮我......
我的编码：
public class videothumb extends Activity
{
private final static Uri MEDIA_EXTERNAL_CONTENT_URI = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
private final static String _ID = MediaStore.Video.Media._ID;
private final static String MEDIA_DATA = MediaStore.Video.Media.DATA;
private static final String NAME = null;
//flag for which one is used for images selection
private Gallery _gallery;
private Cursor _cursor;
private int _columnIndex;
private int[] _videosId;
private Uri _contentUri;
//private int video_column_index;
protected Context _context;
boolean click = true;
boolean setSilent;
TextView tv;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle State) {
super.onCreate(State);
_context = getApplicationContext();
setContentView(R.layout.main);
AlertDialog.Builder alertbox = new AlertDialog.Builder(this);
// set the message to display
alertbox.setMessage("Disclaimer popup window sample..");
// set a positive/yes button and create a listener
alertbox.setPositiveButton("Agree/Close", new DialogInterface.OnClickListener() {
// do something when the button is clicked
public void onClick(DialogInterface dialog, int arg1) {
dialog.cancel();
}
});
// set a negative/no button and create a listener
alertbox.setNegativeButton("Buy", new DialogInterface.OnClickListener() {
// do something when the button is clicked
public void onClick(DialogInterface arg0, int arg1) {
arg0.cancel();
}
});
// display box
alertbox.show();
//set GridView for gallery
_gallery = (Gallery) findViewById(R.id.videoGrdVw);
//set default as external/sdcard uri
_contentUri = MEDIA_EXTERNAL_CONTENT_URI;
//initialize the videos uri
//showToast(_contentUri.getPath());
initVideosId();
//set gallery adapter
setGalleryAdapter();
// Use this to dismiss as per your need...
// popUp.dismiss();
}
/* @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_MENU)) {
Log.d(this.getClass().getName(), "menu button pressed");
// popUp.dismiss();
return false;}
return super.onKeyDown(keyCode, event);
}*/ private void setGalleryAdapter() {
_gallery.setAdapter(new VideoGalleryAdapter(_context));
_gallery.setOnItemClickListener(videogridlistener);
}
@Override
protected void onStop(){
super.onStop();
// We need an Editor object to make preference changes.
// All objects are from android.context.Context
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("silentMode", mSilentMode);
// Commit the edits!
editor.commit();
}
private void initVideosId() {
try
{
//Here we set up a string array of the thumbnail ID column we want to get back
String [] proj={_ID};
// Now we create the cursor pointing to the external thumbnail store
_cursor = managedQuery(_contentUri,
proj, // Which columns to return
null, // WHERE clause; which rows to return (all rows)
null, // WHERE clause selection arguments (none)
null); // Order-by clause (ascending by name)
int count= _cursor.getCount();
System.out.println("total"+_cursor.getCount());
// We now get the column index of the thumbnail id
_columnIndex = _cursor.getColumnIndex(_ID);
//initialize
_videosId = new int[count];
//move position to first element
_cursor.moveToFirst();
for(int i=0;i<count;i++)
{
int id = _cursor.getInt(_columnIndex);
//
_videosId[i]= id;
//
_cursor.moveToNext();
//
}
}catch(Exception ex)
{
showToast(ex.getMessage().toString());
}
}
protected void showToast(String msg)
{
Toast.makeText(_context, msg, Toast.LENGTH_LONG).show();
}
private AdapterView.OnItemClickListener videogridlistener = new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position,long id) {
// Now we want to actually get the data location of the file
String [] proj={MEDIA_DATA};
// We request our cursor again
_cursor = managedQuery(_contentUri,
proj, // Which columns to return
null, // WHERE clause; which rows to return (all rows)
null, // WHERE clause selection arguments (none)
null);
//System.gc();
// video_column_index = _cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
_columnIndex = _cursor.getColumnIndex(MEDIA_DATA);
// Lets move to the selected item in the cursor
_cursor.moveToPosition(position);
String filename = _cursor.getString(_columnIndex);
Intent intent = new Intent(videothumb.this, ViewVideo.class);
intent.putExtra("videofilename", filename);
startActivity(intent);
//showToast(filename);
// Toast.makeText(videothumb.this, "" + position, Toast.LENGTH_SHORT).show();
}
};
private class VideoGalleryAdapter extends BaseAdapter
{
int mGalleryItemBackground;
public VideoGalleryAdapter(Context c)
{
_context = c;
TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
mGalleryItemBackground = a.getResourceId(
R.styleable.Gallery1_android_galleryItemBackground, 0);
a.recycle();
}
public int getCount()
{
return _videosId.length;
}
public Object getItem(int position)
{
return position;
}
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imgVw= new ImageView(_context);
try
{
if(convertView!=null)
{
imgVw= (ImageView) convertView;
}
imgVw.setImageBitmap(getImage(_videosId[position]));
imgVw.setAdjustViewBounds(true);
//imgVw.setBackgroundColor(Color.WHITE);
imgVw.setLayoutParams(new Gallery.LayoutParams(750, 530));
imgVw.setPadding(1,1,1,1);
imgVw.setScaleType(ImageView.ScaleType.FIT_XY);
}
catch(Exception ex)
{
System.out.println("StartActivity:getView()-1 : ex " + ex.getClass() +", "+ ex.getMessage());
}
return imgVw;
}
// Create the thumbnail on the fly
private Bitmap getImage(int id) {
Bitmap originalImage = MediaStore.Video.Thumbnails.getThumbnail(getContentResolver(),id, MediaStore.Video.Thumbnails.MICRO_KIND, null);
System.out.println("ff"+MediaStore.Video.Thumbnails.getThumbnail(getContentResolver(),id, MediaStore.Video.Thumbnails.MICRO_KIND, null));
//Bitmap bmp2 = BitmapFactory.decodeResource(getResources(),
// R.drawable.ccc);
final int reflectionGap = 4;
int width = originalImage.getWidth();
int height = originalImage.getHeight();
//This will not scale but will flip on the Y axis
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
//Create a Bitmap with the flip matix applied to it.
//We only want the bottom half of the image
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height/2, width, height/2, matrix, false);
//Create a new bitmap with same width but taller to fit reflection
Bitmap bitmapWithReflection = Bitmap.createBitmap(width
, (height + height/2), Config.ARGB_8888);
//Create a new Canvas with the bitmap that's big enough for
//the image plus gap plus reflection
Canvas canvas = new Canvas(bitmapWithReflection);
//Draw in the original image
canvas.scale((float) 1.0, (float) 1.0);
canvas.drawBitmap(originalImage, 0, 0, null);
canvas.drawBitmap(originalImage, new Matrix(), null);
// canvas.drawBitmap(bmp2, new Matrix(), null);
canvas.save();
//canvas.drawBitmap(originalImage, 0, 0, null);
//Draw in the gap
Paint deafaultPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
//Draw in the reflection
canvas.drawBitmap(reflectionImage,0, height + reflectionGap, null);
//Create a shader that is a linear gradient that covers the reflection
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0,
bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff,
TileMode.CLAMP);
//Set the paint to use this shader (linear gradient)
paint.setShader(shader);
//Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
//Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width,
bitmapWithReflection.getHeight() + reflectionGap, paint);
return bitmapWithReflection;
}
}
}
答案 0 :(得分：3)
检查此代码，我使用共享首选项编辑了代码：
我做的是，我在共享首选项中保留了一个标志，如果启动了应用程序，它会检查共享首选项中的值， 是的 - 不会显示Dialog， False - 调用Dialog方法，并在方法结束时将Value更改为true，因此下次它将显示Dialog。
public class Map_View extends Activity {
//Shared Preferences Variables //
static SharedPreferences settings;
public static SharedPreferences.Editor editor;
public static final String PREFS_NAME = "TEST";
//End
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle State) {
super.onCreate(State);
_context = getApplicationContext();
setContentView(R.layout.main);
settings=getSharedPreferences(PREFS_NAME, 0);
editor = settings.edit();
if(settings.getBoolean("Alert_Dialog", false)==false){
alert_dialog();
}
//set GridView for gallery
_gallery = (Gallery) findViewById(R.id.videoGrdVw);
//set default as external/sdcard uri
_contentUri = MEDIA_EXTERNAL_CONTENT_URI;
//initialize the videos uri
//showToast(_contentUri.getPath());
initVideosId();
//set gallery adapter
setGalleryAdapter();
}
private void alert_dialog() {
// TODO Auto-generated method stub
AlertDialog.Builder alertbox = new AlertDialog.Builder(this);
alertbox.setMessage("Disclaimer popup window sample..");
alertbox.setPositiveButton("Agree/Close", new DialogInterface.OnClickListener() {
// do something when the button is clicked
public void onClick(DialogInterface dialog, int arg1) {
dialog.cancel();
}
});
// set a negative/no button and create a listener
alertbox.setNegativeButton("Buy", new DialogInterface.OnClickListener() {
// do something when the button is clicked
public void onClick(DialogInterface arg0, int arg1) {
arg0.cancel();
}
});
// display box
alertbox.show();
editor.putBoolean("Alert_Dialog", true);
editor.commit();
}
}
如果您发现任何困难，请告诉我。
感谢Venky ..