倒计时

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private TextView mTextView;
    private Button mButton,mButton1;
    private CountDownTimer mTimer;
    private long current=30000;
    private final String TAG = "MainActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG,"onCreate");
        initView();

    }

    private void initView() {
        mTextView = (TextView) findViewById(R.id.mTextView);
        mButton = (Button) findViewById(R.id.mButton);
        mButton1 = (Button) findViewById(R.id.mButton1);
        mTextView.setOnClickListener(this);
        mButton.setOnClickListener(this);
        mButton1.setOnClickListener(this);
        CreateTimer(0);
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.i(TAG,"onResume");
        CreateTimer(1);
        mTimer.start();
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.i(TAG,"onPause");
        mTimer.cancel();
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.mTextView:

                break;
            case R.id.mButton:
                mTimer.cancel();
                break;
            case R.id.mButton1:
                CreateTimer(1);
                mTimer.start();
                break;
        }
    }

    private void CreateTimer(long count){
        if(count==0){
            current = 30000;
        }
        mTimer =  new CountDownTimer(current, 1000){
            @Override
            public void onTick(long l) {
                current = l;
                mTextView.setText("this is "+l/1000);
            }

            @Override
            public void onFinish() {
                mTextView.setText("done");
                current = 30000;
            }
        };
    }

}