Android笔记：实现加载的progressDialog之后跳转到程序主界面

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Android笔记：实现加载的progressDialog之后跳转到程序主界面       

        分类：            Android2011-07-18 22:331982人阅读评论(5)收藏举报

因为考虑到有些程序加载时间相对较长，所以在启动主界面之前，实现一个加载的progressDialog对话框来延缓，相对来说可以提高用户体验度。

如果是直接进入主界面，即activity，界面因为加载时间长，一片漆黑，让用户老觉得这程序不行。

贴出源码：

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);
            //设置一个progressdialog的弹窗
            dialog = ProgressDialog.show(this, null, "程序正在加载，请稍候...", true, false);
            //启动一个处理loading业务的线程
            new LoadingThread(this).start();
    }

    private class LoadingThread extends Thread {
            private LoadingActivity activity;

            public LoadingThread(LoadingActivity act) {
                    Log.d(">>>>>LoadingThread", "构造方法");
                    activity = act;
            }

            public void run() {
                    Log.d(">>>>>LoadingThread", "传递message");
                    //*********************
                    //  处理业务
                    //*********************

                    //发送消息
                    activity.mHandler.sendEmptyMessage(0);
            }
    }

    //处理跳转到主Activity
    private Handler mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                    // TODO Auto-generated method stub
                    Log.d(">>>>>Mhandler", "开始handleMessage");
                    Intent mIntent = new Intent();
                    mIntent.setClass(LoadingActivity.this, PalmHospital_main_Activity.class);
                    startActivity(mIntent);
                    LoadingActivity.this.finish();
                    Log.d(">>>>>Mhandler", "LoadActivity关闭");
                    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);
            //设置一个progressdialog的弹窗
            dialog = ProgressDialog.show(this, null, "程序正在加载，请稍候...", true, false);
            //启动一个处理loading业务的线程
            new LoadingThread(this).start();
    }

    private class LoadingThread extends Thread {
            private LoadingActivity activity;

            public LoadingThread(LoadingActivity act) {
                    Log.d(">>>>>LoadingThread", "构造方法");
                    activity = act;
            }

            public void run() {
                    Log.d(">>>>>LoadingThread", "传递message");
                	//*********************
                    //	处理业务
                	//*********************
                    
                    //发送消息
                    activity.mHandler.sendEmptyMessage(0);
            }
    }
    
    //处理跳转到主Activity
    private Handler mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                    // TODO Auto-generated method stub
                    Log.d(">>>>>Mhandler", "开始handleMessage");
                    Intent mIntent = new Intent();
                    mIntent.setClass(LoadingActivity.this, PalmHospital_main_Activity.class);
                    startActivity(mIntent);
                    LoadingActivity.this.finish();
                    Log.d(">>>>>Mhandler", "LoadActivity关闭");
                    if (dialog.isShowing())
                            dialog.dismiss();
            }
    };
}

方法二：相对来说要容易理解一点，贴图

public class LoadingActivity extends Activity {
    private ProgressDialog dialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            //设置一个progressdialog的弹窗
            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();

    }

    //处理跳转到主Activity
    private Handler mHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                    // TODO Auto-generated method stub
                    Log.d(">>>>>Mhandler", "开始handleMessage");
                    Intent mIntent = new Intent();
                    mIntent.setClass(LoadingActivity.this, PalmHospital_main_Activity.class);
                    startActivity(mIntent);
                    LoadingActivity.this.finish();
                    Log.d(">>>>>Mhandler", "LoadActivity关闭");
                    if (msg.what == 0) {
                        dialog.dismiss();
                }
            }
    };
}