显示和设置ProgressBar的进度

显示和设置进度条的进度主要用到了以下几个属性和方法：

android:max	设置进度条的最大值
android:progress	设置第一进度条的当前进度
android:secondaryProgress	设置第二进度条的当前进度

void incrementProgressBy(int diff)： 增加第一进度条的进度，diff 是每次增加的量；当diff 为负值的时候为减少；

void incrementSecondaryProgressBy(int diff)： 增加第二进度条的进度，方法同上

void setProgress(int progress)： 设置第一进度条的进度；

void setSecondaryProgress(int secondaryProgress)： 设置第二进度条的进度；

int getProgress()： 获得第一进度条的进度;

int getSecondaryProgress()： 获得第二进度条的进度；

完整示例代码如下：

activity_main.xml

MainActivity.java

public class MainActivity extends Activity implements OnClickListener {
	
	private ProgressBar progressBar;
	private Button add;
	private Button reduce;
	private Button reset;
	private TextView progressText;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		progressBar = (ProgressBar)findViewById(R.id.progressBar1);
		add = (Button)findViewById(R.id.add);
		reduce = (Button)findViewById(R.id.reduce);
		reset = (Button)findViewById(R.id.reset);
		progressText = (TextView)findViewById(R.id.progress_text);
		add.setOnClickListener(this);
		reduce.setOnClickListener(this);
		reset.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		switch(v.getId()){
		case R.id.add:
			progressBar.incrementProgressBy(10);
			progressBar.incrementSecondaryProgressBy(10);
			break;
		case R.id.reduce:
			progressBar.incrementProgressBy(-10);
			progressBar.incrementSecondaryProgressBy(-10);
			break;
		case R.id.reset:
			progressBar.setProgress(50);
			progressBar.setSecondaryProgress(80);
			break;
		}
		refreshProgressText();
	}
	
	private void refreshProgressText(){
		int firstProgress = progressBar.getProgress();
		int secondaryProgress = progressBar.getSecondaryProgress();
		progressText.setText("First progress: " + firstProgress + "%\n" + "Secondary progress" + secondaryProgress + "%");
	}

}

效果如图：