Android開發入門（一）詳解活動 1.6 顯示復雜對話框

除了“對話框”進度條，也可以創建一個顯示“操作進度”的對話框，例如顯示正在下載的狀態。

1. 創建一個工程：Dialog。

2. main.xml中的代碼。

<?xml version="1.0" encoding="utf-8"?>     
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" >     
         
    <Button     
        android:id="@+id/btn_dialog3" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:onClick="onClick3" 
        android:text="Click to display a detailed progress dialog" />     
         
</LinearLayout>

3. DialogActivity.java中的代碼。

public class DialogActivity extends Activity {     
    ProgressDialog progressDialog;     
         
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) {     
        super.onCreate(savedInstanceState);     
        setContentView(R.layout.main);     
    }     
         
    public void onClick3(View v) {     
        showDialog(1);     
        progressDialog.setProgress(0);     
         
        new Thread(new Runnable() {     
            public void run() {     
                for (int i = 1; i <= 15; i++) {     
                    try {     
                        // ---simulate doing something lengthy---     
                        Thread.sleep(1000);     
                        // ---update the dialog---     
                        progressDialog.incrementProgressBy((int) (100 / 15));     
                    } catch (InterruptedException e) {     
                        e.printStackTrace();     
                    }     
                }     
                progressDialog.dismiss();     
            }     
        }).start();     
    }     
         
    @Override 
    protected Dialog onCreateDialog(int id) {     
        switch (id) {     
        case 1:     
            progressDialog = new ProgressDialog(this);     
            progressDialog.setIcon(R.drawable.ic_launcher);     
            progressDialog.setTitle("Downloading files...");     
            progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);     
            progressDialog.setButton(DialogInterface.BUTTON_POSITIVE, "OK",     
                    new DialogInterface.OnClickListener() {     
                        public void onClick(DialogInterface dialog,     
                                int whichButton) {     
                            Toast.makeText(getBaseContext(), "OK clicked!",     
                                    Toast.LENGTH_SHORT).show();     
                        }     
                    });     
            progressDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel",     
                    new DialogInterface.OnClickListener() {     
                        public void onClick(DialogInterface dialog,     
                                int whichButton) {     
                            Toast.makeText(getBaseContext(), "Cancel clicked!",     
                                    Toast.LENGTH_SHORT).show();     
                        }     
                    });     
            return progressDialog;     
        }     
        return null;     
    }     
}

4. 按F11調試。