进度条的具体使用

1.布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context="com.example.yuekao005.Main2Activity">

    <ProgressBar
        android:id="@+id/pb"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/but"
        android:text="点击"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

2.代码实现

public class Main2Activity extends AppCompatActivity implements View.OnClickListener {

    private ProgressBar pb;
    private Button but;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        initView();
    }

    private void initView() {
        pb = (ProgressBar) findViewById(R.id.pb);
        but = (Button) findViewById(R.id.but);

        but.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.but:
                final ProgressDialog dialog = new ProgressDialog(this);
                dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);// 设置水平进度条
                dialog.setCancelable(true);// 设置是否能够经过点击Back键取消
                dialog.setCanceledOnTouchOutside(false);// 设置在点击Dialog外是否取消Dialog进度条
                dialog.setMax(100);
                dialog.setMessage("这是一个水平进度条");
                dialog.show();
                new Thread(new Runnable() {

                    @Override
                    public void run() {
                        // TODO Auto-generated method stub
                        int i = 0;
                        while (i < 11) {
                            try {
                                Thread.sleep(200);
                                // 更新进度条的进度,能够在子线程中更新进度条进度
                                dialog.incrementProgressBy(10);
                                i++;
                                if (i==10) {
                                    dialog.dismiss();
                                    //当i==10的时候handler对象发送消息

                                    hand.sendEmptyMessage(1);
                                }
                            } catch (Exception e) {
                                // TODO: handle exception
                            }
                        }
                        // 在进度条走完时删除Dialog


                    }
                }).start();
                break;
        }
    }
    Handler hand = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what==1) {
                Intent intent = new Intent(Main2Activity.this, Main2Activity.class);
                startActivityForResult(intent, 100);
            }
        }
    };
}