关于Thread 几个写法的试验与疑问

package com.example.mydemo01;

import java.util.Timer;
import java.util.TimerTask;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class MyMain extends Activity {
    private TextView tv1;
    private int count;

    private final Handler mHandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
            case 1:
                tv1.setText("count:" + count);
                count++;
                break;

            default:
                break;
            }
        };
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_main);
        tv1 = (TextView) findViewById(R.id.textView1);

    }

    @Override
    protected void onResume() {
        count = 0;
        // myPost();//error
        // new MyThread().start();//ok

        // myNewTNewR();//error
        // new MyRunnable().run();//error
        // myTimer();//ok
        // myDirectFor();//error

/**    ERROR    
 * Thread MyBitThread = new Thread(){
            public void run() {
                for (int i = 0; i < 99999; i++) {
                    Log.d("linsen", "i=" + i);
                    mHandler.sendEmptyMessage(1);
                }
            };
        };
        MyBitThread.start();*/
        
        new MyBigThread().start();
        super.onResume();
    }
    class MyBigThread extends Thread{
        @Override
        public void run() {
            for (int i = 0; i < 99999; i++) {
                Log.d("linsen", "i=" + i);
                mHandler.sendEmptyMessage(1);
            }
            super.run();
        }
    }
    private void myDirectFor() {
        for (int i = 0; i < 99999; i++) {
            Log.d("linsen", "i=" + i);
            mHandler.sendEmptyMessage(1);
            // runOnUiThread(new Runnable() {
            //
            // @Override
            // public void run() {
            // // tv1.setText("count:" + count);
            // // count++;//error
            //
            // mHandler.sendEmptyMessage(1);
            //
            // }
            // });
        }

    }
    
     

    private void myTimer() {
        new Timer().schedule(new TimerTask() {

            @Override
            public void run() {
                for (int i = 0; i < 50; i++) {
                    Log.d("linsen", "i=" + i);
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    mHandler.sendEmptyMessage(1);

                }

            }
        }, 500, 500);
    }

    class MyThread extends Thread {
        @Override
        public void run() {
            for (int i = 0; i < 50; i++) {
                Log.d("linsen", "i=" + i);
                try {
                    Thread.sleep(500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                mHandler.sendEmptyMessage(1);

            }

            super.run();
        }
    }

    class MyRunnable implements Runnable {

        @Override
        public void run() {
            for (int i = 0; i < 50; i++) {
                Log.d("linsen", "i=" + i);
                try {
                    Thread.sleep(500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                mHandler.sendEmptyMessage(1);

            }
        }

    }

    private void myNewTNewR() {
        Thread t = new Thread(new Runnable() {
            public void run() {
                for (int i = 0; i < 20; i++) {
                    Log.d("linsen", "i=" + count);
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    // tv1.setText("count:" + count);
                    // count++;
                    mHandler.sendEmptyMessage(1);
                }
            }
        });
        t.start();

    }

    private void myPost() {

        mHandler.post(new Runnable() {

            @Override
            public void run() {
                for (int i = 0; i < 20; i++) {
                    Log.d("linsen", "i=" + count);
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    tv1.setText("count:" + count);
                    count++;

                }
            }

        });

    }

    private void myRunOnUiThread() {
        runOnUiThread(new Runnable() {

            @Override
            public void run() {
                // try {
                // this.wait(1000);
                // } catch (InterruptedException e) {
                // // TODO Auto-generated catch block
                // e.printStackTrace();
                // }
                for (int i = 0; i < 10; i++) {
                    tv1.setText("count:" + count);
                    count++;
                }
            }
        });
    }
}