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874天前import android.app.Activity; |
import android.os.Bundle; |
import android.os.Handler; |
import android.os.Message; |
import android.view.View; |
import android.widget.Button; |
import android.widget.ProgressBar; |
import android.widget.TextView; |
/** |
* 进度条ProgressBar，消息传递Handler |
*/ |
public class EX04_17 extends Activity { |
private TextView mTextView01; |
private Button mButton01; |
private ProgressBar mProgressBar01; |
public int intCounter = 0; |
/* 自定义Handler讯息代码，用以作为识别事件处理 */ |
protected static final int GUI_STOP_NOTIFIER = 0x108; |
protected static final int GUI_THREADING_NOTIFIER = 0x109; |
@Override |
public void onCreate(Bundle savedInstanceState) { |
super.onCreate(savedInstanceState); |
setContentView(R.layout.main); |
mButton01 = (Button) findViewById(R.id.myButton1); |
mTextView01 = (TextView) findViewById(R.id.myTextView1); |
mProgressBar01 = (ProgressBar) findViewById(R.id.myProgressBar1); |
mProgressBar01.setIndeterminate(false); |
mButton01.setOnClickListener(new Button.OnClickListener() { |
@Override |
public void onClick(View v) { |
// TODO Auto-generated method stub |
mTextView01.setText(R.string.str_progress_start); |
/* 将隐藏的ProgressBar显示出来 */ |
mProgressBar01.setVisibility(View.VISIBLE); |
/* 指定Progress为最多100 */ |
mProgressBar01.setMax(100); |
/* 初始Progress为0 */ |
mProgressBar01.setProgress(0); |
/* 起始一个线程 */ |
new Thread(new Runnable() { |
public void run() { |
/* 预设0至9，共执行10次的循环叙述 */ |
for (int i = 0; i < 10; i++) { |
try { |
intCounter = (i + 1) * 20; |
Thread.sleep(1000); |
/* 当Thread执行5秒后显示执行结束 */ |
if (i == 4) { |
/* 以Message对象，传递参数给Handler */ |
Message m = new Message(); |
/* 以what属性指定User自定义 */ |
m.what = EX04_17.GUI_STOP_NOTIFIER; |
EX04_17.this.myMessageHandler |
.sendMessage(m); |
break; |
} else { |
Message m = new Message(); |
m.what = EX04_17.GUI_THREADING_NOTIFIER; |
EX04_17.this.myMessageHandler |
.sendMessage(m); |
} |
} catch (Exception e) { |
e.printStackTrace(); |
} |
} |
} |
}).start(); |
} |
}); |
} |
/* Handler建构之后，会聆听传来的讯息代码 */ |
Handler myMessageHandler = new Handler() { |
public void handleMessage(Message msg) { |
switch (msg.what) { |
/* 当取得识别为 离开线程时所取得的讯息 */ |
case EX04_17.GUI_STOP_NOTIFIER: |
/* 显示执行终了 */ |
mTextView01.setText(R.string.str_progress_done); |
/* 设定ProgressBar Widget为隐藏 */ |
mProgressBar01.setVisibility(View.GONE); |
Thread.currentThread().interrupt(); |
break; |
/* 当取得识别为 持续在线程当中时所取得的讯息 */ |
case EX04_17.GUI_THREADING_NOTIFIER: |
if (!Thread.currentThread().isInterrupted()) { |
mProgressBar01.setProgress(intCounter); |
/* 将显示进度显示于TextView当中 */ |
mTextView01 |
.setText(getResources().getText( |
R.string.str_progress_start) |
+ "(" |
+ Integer.toString(intCounter) |
+ "%)\n" |
+ "Progress:" |
+ Integer.toString(mProgressBar01 |
.getProgress()) |
+ "\n" |
+ "Indeterminate:" |
+ Boolean.toString(mProgressBar01 |
.isIndeterminate())); |
} |
break; |
} |
super.handleMessage(msg); |
} |
}; |
} |
