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private Button btn_one;
private Button btn_two;
private Button btn_three;
private ProgressDialog pd1 = null;
private ProgressDialog pd2 = null;
private final static int MAXVALUE = 100;
private int progressStart = 0;
private int add = 0;
private Context mContext = null;

// Define a Handler for updating progress, as only the main thread can update the interface, so a Handler is needed to pass information
final Handler hand = new Handler()
{
    @Override
    public void handleMessage(Message msg) {
        // Here, if the received message code is 123
        if(msg.what == 123)
        {
            // Set the current value of the progress bar
            pd2.setProgress(progressStart);
        }
        // If the current value is greater than or equal to the maximum value of the progress bar, call the dismiss() method to close the dialog
        if(progressStart >= MAXVALUE)
        {
            pd2.dismiss();
        }
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mContext = MainActivity.this;
    bindViews();
}

private void bindViews() {
    btn_one = (Button) findViewById(R.id.btn_one);
    btn_two = (Button) findViewById(R.id.btn_two);
    btn_three = (Button) findViewById(R.id.btn_three);
    btn_one.setOnClickListener(this);
    btn_two.setOnClickListener(this);
    btn_three.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.btn_one:
            // Here, the parameters in order are: context, title, content, whether to show progress, whether it can be closed with the cancel button
            ProgressDialog.show(MainActivity.this, "Loading Resources", "Please wait while resources are loading...", false, true);
            break;
        case R.id.btn_two:
            pd1 = new ProgressDialog(mContext);
            // Set title, content, whether it can be closed with the cancel button, and whether to show progress in order
            pd1.setTitle("Software Updating");
            pd1.setMessage("The software is updating, please wait...");
            pd1.setCancelable(true);
            // Here, set the style of the progress bar, HORIZONTAL is a horizontal progress bar, SPINNER is a circular progress bar
            pd1.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            pd1.setIndeterminate(true);
            // Call the show() method to display the ProgressDialog
            pd1.show();
            break;
        case R.id.btn_three:
            // Initialize properties
            progressStart = 0;
            add = 0;
            // Set some properties in order
            pd2 = new ProgressDialog(MainActivity.this);
            pd2.setMax(MAXVALUE);
            pd2.setTitle("Reading File");
            pd2.setMessage("Please wait while the file is loading...");
            // Here, set it so that the progress bar cannot be closed by pressing the cancel button
            pd2.setCancelable(false);
            pd2.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            // Here, set whether to show progress, set to false to display it!
            pd2.setIndeterminate(false);
            pd2.show();
            // Here, create a new thread, override the run() method,
            new Thread()
            {
                public void run()
                {
                    while(progressStart < MAXVALUE)
                    {
                        // The algorithm here determines the change of the progress bar, which can be written as needed
                        progressStart = 2 * usetime() ;
                        // Send the message code to hand to update the interface
                        hand.sendEmptyMessage(123);
                    }
                }
            }.start();
            break;
    }
}

// Here, set a time-consuming method:
private int usetime() {
    add++;
    try{
        Thread.sleep(100