倒計時

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;            }        };    }}