Question

我在我的第一个活动中有一个Button，它将其背景改为onclick并使用SharedPreferences保存，但我想再设置一个代码，当我检查按钮时，它将我的第二个活动中的TextView文本设置为＆＃34 ;扣经过＆＃34;当我取消选中它时，将TextView的文本设置为＆＃34; Button-Unchecked＆＃34;然后保存文本（使用SharedPreferences或其他任何东西）。在我的第一个活动中：

public class MainActivity extends Activity {
private boolean likechek;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final Button like = (Button) findViewById(R.id.like);
    like.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(Dog.this);
            sp.edit().putBoolean("like_", !likechek).commit();
            LikeAnalayzer();
        }
    });

}

    private void LikeAnalayzer() {
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
    likechek = sp.getBoolean("like_", false);
    UpdateLikeButton();
}

    private void UpdateLikeButton() {
    Button like = (Button) findViewById(R.id.like);

    if(likechek){
        like.setBackgroundResource(R.drawable.starf);
    }else{
        like.setBackgroundResource(R.drawable.star);

    }

}           
}

和第二个（空）：

public class Fav extends Activity {
TextView tv ;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fav);
    tv = (TextView) findViewById(R.id.tv);
    tv.setText("");
    }
}

感谢您的回答，我真的需要它。

Answer 1

如果我理解你正确，你想要在检查按钮的情况下将文本设置为textView，这样你可以像这样更改背景，例如：

private void UpdateLikeButton() {
    Button like = (Button) findViewById(R.id.like);
    TextView myTextView = (TextView)findViewById(R.id.textView);

    if(likechek){
        like.setBackgroundResource(R.drawable.starf);
        myTextView.setText("Button-Checked");
        //and save in the shared preferences the state:
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(Dog.this);
        sp.edit().putString("button_state", "Button-Checked").commit();
    }else{
        like.setBackgroundResource(R.drawable.star);
        myTextView.setText("Button-Unchecked");
        //and save in the shared preferences the state:
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(Dog.this);
        sp.edit().putString("button_state", "Button-Unchecked").commit();
    }

}

如果你想在第二个活动中设置textView的文本，只需跳过第一个myTextView.setText("Button-Checked");中的部分，如下所示：

private void UpdateLikeButton() {
    Button like = (Button) findViewById(R.id.like);

    if(likechek){
        like.setBackgroundResource(R.drawable.starf);
        //and save in the shared preferences the state:
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(Dog.this);
        sp.edit().putString("button_state", "Button-Checked").commit();
    }else{
        like.setBackgroundResource(R.drawable.star);
        //and save in the shared preferences the state:
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(Dog.this);
        sp.edit().putString("button_state", "Button-Unchecked").commit();
    }

}

并在第二个这样做：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fav);
    tv = (TextView) findViewById(R.id.tv);
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
    String buttonState = sp.getString("button_state", "");
    tv.setText(buttonState);
}

希望这有助于你：）

保存TextView的更改文本

1 个答案: