android AlertDialog

package com.itheima74.alertdialog; import android.app.AlertDialog; import android.app.ProgressDialog; import android.content.DialogInterface; import android.os.Bundle; import android.os.SystemClock; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Toast; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } // 普通对话框 public void showDialog(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setIcon(R.mipmap.ic_launcher); builder.setTitle("警告:"); builder.setMessage("世界上最遥远的距离是没有网络..."); builder.setPositiveButton("确定", null); builder.setNegativeButton("取消", null); builder.show(); } // 单选对话框 public void showSingleDialog(View view) { AlertDialog.Builder builder = new AlertDialog.Builder(this); final String[] res = {"android", "ios", "java", "c", "c++"}; builder.setSingleChoiceItems(res, 0, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(MainActivity.this, "选中了:" + res[which], Toast.LENGTH_SHORT).show(); dialog.dismiss(); } }); builder.show(); } // 多选对话框 public void showMulDialog(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(this); final String[] res = {"android", "ios", "java", "c", "c++"}; // 需要一个中间变量保存当前条目是否选中 final boolean[] buffers = {false, false, false, false, false}; builder.setMultiChoiceItems(res, buffers, new DialogInterface.OnMultiChoiceClickListener() { @Override public void onClick(DialogInterface dialog, int which, boolean isChecked) { Toast.makeText(MainActivity.this, "which:" + which + ",ischecked:" + isChecked, Toast.LENGTH_SHORT).show(); buffers[which] = isChecked; } }); builder.setNegativeButton("取消", null); builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < buffers.length; i++) { if (buffers[i]) { sb.append(res[i]).append(" "); } } Toast.makeText(MainActivity.this, "选中了:" + sb.toString(), Toast.LENGTH_SHORT).show(); dialog.dismiss(); } }); builder.show(); } // 点击按钮,显示进度条对话框 public void showProgressDialog(View v) { // 创建一个ProgressDialog final ProgressDialog progressDialog = new ProgressDialog(this); // 设置水平 progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); // 设置头像 progressDialog.setIcon(R.mipmap.ic_launcher); progressDialog.setTitle("显示下载进度:"); progressDialog.setMessage("当前进度..."); // 模拟进度 progressDialog.setMax(100); new Thread() { @Override public void run() { for (int i = 1; i <= 100; i++) { progressDialog.setProgress(i); SystemClock.sleep(30); } progressDialog.dismiss(); // 告知用户下载完成,主线程运行 runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(MainActivity.this, "下载完成!", Toast.LENGTH_SHORT).show(); } }); } }.start(); progressDialog.show(); } }