Java 在按下时将progressbar重置为0
我试着像使用30秒计时器一样使用progressbar。它工作得很好,但当我单击“上一步”按钮时,progressbar的进度仍在继续。单击backbutton时,无法将progressbar进度重置为0。 这是我的代码:Java 在按下时将progressbar重置为0,java,android,progress-bar,reset,Java,Android,Progress Bar,Reset,我试着像使用30秒计时器一样使用progressbar。它工作得很好,但当我单击“上一步”按钮时,progressbar的进度仍在继续。单击backbutton时,无法将progressbar进度重置为0。 这是我的代码: 维护性: public class MainActivity extends AppCompatActivity { public Button btnA; @Override protected void onCreate(Bundle savedInstanceSta
维护性:
public class MainActivity extends AppCompatActivity {
public Button btnA;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnA = (Button)findViewById(R.id.btnA);
btnA.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intentA = new Intent(MainActivity.this,SecondActivity.class);
startActivity(intentA);
}
});
}
}
第二项活动:public class SecondActivity extends AppCompatActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Context context;
float from;
float to;
final TextView textV;
final ProgressBar mProgressBar;
CountDownTimer mCountDownTimer;
final int[] i = {0};
textV = (TextView)findViewById(R.id.tvFinal);
mProgressBar = (ProgressBar)findViewById(R.id.progressbar);
mProgressBar.setProgress(i[0]);
mCountDownTimer=new CountDownTimer(30000,1000) {
@Override
public void onTick(long millisUntilFinished) {
Log.v("Log_tag", "Tick of Progress"+ i[0] + millisUntilFinished);
i[0]++;
mProgressBar.setProgress((int) i[0] *100/(30000/1000));
}
@Override
public void onFinish() {
i[0]++;
mProgressBar.setProgress(100);
textV.setText("finish");
Intent intent = new Intent(SecondActivity.this, SecondActivity.class);
startActivity(intent);
}
};
mCountDownTimer.start();
}
}
为了实现后退按钮的行为,您需要覆盖
onBackPressed()
,然后实现重置progressbar结果的方法
例如:
@Override
public void onBackPressed() {
super.onBackPressed();
progressBar.setProgress(0);
}
为了实现后退按钮的行为,您需要覆盖
onBackPressed()
,然后实现重置progressbar结果的方法
例如:
@Override
public void onBackPressed() {
super.onBackPressed();
progressBar.setProgress(0);
}