Android筆記：實現載入的progressDialog之後跳轉到程式主介面

因為考慮到有些程式載入時間相對較長，所以在啟動主介面之前，實現一個載入的progressDialog對話方塊來延緩，相對來說可以提高使用者體驗度。

如果是直接進入主介面，即activity，介面因為載入時間長，一片漆黑，讓使用者老覺得這程式不行。

貼出源碼：

方法一：

public class LoadingActivity extends Activity {    private ProgressDialog dialog;    @Override    protected void onCreate(Bundle savedInstanceState) {            // TODO Auto-generated method stub            super.onCreate(savedInstanceState);            //設定一個progressdialog的彈窗            dialog = ProgressDialog.show(this, null, "程式正在載入，請稍候...", true, false);            //啟動一個處理loading業務的線程            new LoadingThread(this).start();    }    private class LoadingThread extends Thread {            private LoadingActivity activity;            public LoadingThread(LoadingActivity act) {                    Log.d(">>>>>LoadingThread", "構造方法");                    activity = act;            }            public void run() {                    Log.d(">>>>>LoadingThread", "傳遞message");                //*********************                    //處理業務                //*********************                                        //發送訊息                    activity.mHandler.sendEmptyMessage(0);            }    }        //處理跳轉到主Activity    private Handler mHandler = new Handler() {            @Override            public void handleMessage(Message msg) {                    // TODO Auto-generated method stub                    Log.d(">>>>>Mhandler", "開始handleMessage");                    Intent mIntent = new Intent();                    mIntent.setClass(LoadingActivity.this, PalmHospital_main_Activity.class);                    startActivity(mIntent);                    LoadingActivity.this.finish();                    Log.d(">>>>>Mhandler", "LoadActivity關閉");                    if (dialog.isShowing())                            dialog.dismiss();            }    };}

方法二：相對來說要容易理解一點，貼圖

public class LoadingActivity extends Activity {    private ProgressDialog dialog;    @Override    protected void onCreate(Bundle savedInstanceState) {            // TODO Auto-generated method stub            super.onCreate(savedInstanceState);            //設定一個progressdialog的彈窗            dialog = ProgressDialog.show(this, "加載中...", "正在搜尋。。。。，請稍後！");            Thread thread = new Thread(new Runnable() {                    public void run() {                                                                 //do...                                                                                        Message message = new Message();                            message.what = 0;                            mHandler.sendMessage(message);                    }            });            thread.start();    }        //處理跳轉到主Activity    private Handler mHandler = new Handler() {            @Override            public void handleMessage(Message msg) {                    // TODO Auto-generated method stub                    Log.d(">>>>>Mhandler", "開始handleMessage");                    Intent mIntent = new Intent();                    mIntent.setClass(LoadingActivity.this, PalmHospital_main_Activity.class);                    startActivity(mIntent);                    LoadingActivity.this.finish();                    Log.d(">>>>>Mhandler", "LoadActivity關閉");                    if (msg.what == 0) {                        dialog.dismiss();                }            }    };}