android 线程优先级设置方法

转载自 http://zengyan2012.iteye.com/blog/1228770

android.os.Process.setThreadPriority （int priority）或
　　android.os.Process.setThreadPriority （int tid， int priority）
　　priority：【-20， 19】，高优先级 -> 低优先级.
java.lang.Thread.setPriority （int priority）
　　priority：【1， 10】，低优先级 -> 高优先级.
　　测试后发现，使用android自己的API（第1种方法）设置的优先级，对线程调度影响显著.

import android.app.Activity;import android.os.Bundle;import android.os.Process;import android.util.Log;public class TestThreadPriority extends Activity {    private static final String TAG = "TestThreadPriority";    private boolean mNeedExit = false;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        MyThread a = new MyThread("Thread A");        a.setOSPriority(Process.THREAD_PRIORITY_LOWEST); // 19        a.setPriority(Thread.MAX_PRIORITY); // 10        MyThread b = new MyThread("Thread B");        b.setOSPriority(Process.THREAD_PRIORITY_URGENT_AUDIO); // -19        b.setPriority(Thread.MIN_PRIORITY); // 1        a.start();        b.start();    }    @Override    public void onBackPressed() {        mNeedExit = true;        super.onBackPressed();    }    private class MyThread extends Thread {        private int mOSPriority = Process.THREAD_PRIORITY_DEFAULT;        private int mLoopCount = 0;        public MyThread(String threadName) {            super(threadName);        }        public void setOSPriority(int p) {            mOSPriority = p;        }        @Override        public void run() {            Process.setThreadPriority(mOSPriority);            while (!mNeedExit) {                mLoopCount++;                Math.log(Math.random() * 1000); // calculation test                Log.d(TAG,                        new StringBuilder().append(getName())                                .append(" os priority: ").append(mOSPriority)                                .append(" java priority: ")                                .append(getPriority()).append(" loop count: ")                                .append(mLoopCount).toString());            }            Log.d(TAG,                    new StringBuilder().append(getName()).append(" exiting...")                            .append(" os priority: ").append(mOSPriority)                            .append(" java priority: ").append(getPriority())                            .append(" loop count: ").append(mLoopCount)                            .toString());        }    }}

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