[英]Android - Progress Bar not updating
我有一個線程可以從txt文件中提取數據后將數據更新到SQLite DB中,我想顯示一個對話框,其進度將相應地更新。
以下代碼正確運行,即使runOnUiThread也適用於關閉,但是Progress尚未更新。
Thread thread = new Thread(){
@Override
public void run() {
Log.d("THREAD", "in run");
// TODO Auto-generated method stub
try {
Log.d("DATABASE", "Creating Database");
SQLiteDatabase db = openOrCreateDatabase("WordDatabase", MODE_PRIVATE, null);
Log.d("DATABASE", "Checking table exist");
Cursor tableName = db.rawQuery("SELECT DISTINCT tbl_name FROM sqlite_master WHERE tbl_name='Words'",null);
if(tableName.getCount() < 1){
Log.d("DATABASE", "Creating Table");
db.execSQL("CREATE TABLE IF NOT EXISTS Words (Word TEXT);");
ContentValues cv = new ContentValues();
float totalWords = 5000;// 144895;
float wordsSelected = 0;
Log.d("CONTENT", "Entering Values");
Scanner scanner = new Scanner(getApplicationContext().getAssets().open("english.txt"));
while(scanner.hasNext()){
int i=0;
while(scanner.hasNext() && i<500 ){
cv.put("Word", scanner.next());
db.insert("Words", null, cv);
i++;
wordsSelected++;
final float percent = (wordsSelected/totalWords)*100;
Log.d("PROGRESS", Float.toString((int)percent));
runOnUiThread(new Runnable() {
@Override
public void run() {
dialog.setProgress((int) percent);
if(percent == 100) dialog.dismiss();
}
});
}
cv.clear();
Log.d("CONTENT", "inserting");
}
Log.d("CONTENT", "Completed");
}
}catch(Exception ex){
ex.printStackTrace();
}
}
};
thread.start();
runOnUiThread在這里不起作用,您應該使用Handler
。 這是在您定義thread
時使用的方法。
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
int percent = msg.what;
dialog.setProgress((int) percent);
if (percent == 100) dialog.dismiss();
}
};
現在,您可以從thread
中調用handler
:
// ...
final float percent = (wordsSelected/totalWords) * 100;
Log.d("PROGRESS", Float.toString((int) percent));
handler.sendEmptyMessage((int) percent));
// ...
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