Android筆記：實現加載的progressDialog之后跳轉到程序主界面

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Android筆記：實現加載的progressDialog之后跳轉到程序主界面       

        分類：            Android 2011-07-18 22:33 1982人閱讀 評論(5) 收藏 舉報

因為考慮到有些程序加載時間相對較長，所以在啟動主界面之前，實現一個加載的progressDialog對話框來延緩，相對來說可以提高用戶體驗度。

如果是直接進入主界面，即activity，界面因為加載時間長，一片漆黑，讓用戶老覺得這程序不行。

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);
            //設置一個progressdialog的彈窗
            dialog = ProgressDialog.show(this, null, "程序正在加載，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
                    //*********************

                    //發送消息
                    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();
            }
    };
}

public class LoadingActivity extends Activity {
    private ProgressDialog dialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            //設置一個progressdialog的彈窗
            dialog = ProgressDialog.show(this, null, "程序正在加載，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
                	//*********************
                    
                    //發送消息
                    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);
            //設置一個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();
                }
            }
    };
}