android dialog ——ProgressDialog 进度条对话框详解

package com.dialog.activity; import android.app.Activity; import android.app.Dialog; import android.app.ProgressDialog; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.widget.Button; public class ProgressDialogActivity extends Activity { private final int PROGRESS_DIALOG = 1; private final int INCREASE = 0; private ProgressDialog progressDialog = null; private Handler handler = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.progress_dialog_layout); Button button = (Button) findViewById(R.id.button); View.OnClickListener listener = new View.OnClickListener() { @Override public void onClick(View view) { showDialog(PROGRESS_DIALOG); } }; button.setOnClickListener(listener); handler = new Handler() { @Override public void handleMessage(Message msg) { switch(msg.what) { case INCREASE: progressDialog.incrementProgressBy(1); if(progressDialog.getProgress() >= 100) { // progressDialog.dismiss(); } break; } super.handleMessage(msg); } }; } @Override public Dialog onCreateDialog(int id) { switch(id) { case PROGRESS_DIALOG: //this表示该对话框是针对当前Activity的 progressDialog = new ProgressDialog(this); //设置最大值为100 progressDialog.setMax(100); //设置进度条风格STYLE_HORIZONTAL progressDialog.setProgressStyle( ProgressDialog.STYLE_HORIZONTAL); progressDialog.setTitle("进度条对话框"); break; } return progressDialog; } @Override public void onPrepareDialog(int id, Dialog dialog) { switch(id) { case PROGRESS_DIALOG: //将进度条清0 progressDialog.incrementProgressBy(-progressDialog.getProgress()); new Thread() { public void run() { for(int i=0; i<=100; i++) { handler.sendEmptyMessage(INCREASE); if(progressDialog.getProgress() >= 100) { break; } try { Thread.sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } } } }.start(); break; } } }