Java 使用其他活动更改imagebutton

我想从另一个事件更改

ImageButtons

，但这不起作用 这是我的主要活动：

boolean defaultValue = false; 

SharedPreferences prefs = getSharedPreferences("YourAppNamePrefs", MODE_PRIVATE);
boolean shouldChangeButton = prefs.getBoolean("shouldChangeButton", defaultValue);

if(shouldChangeButton) {
    ImageButton ib = (ImageButton) findViewById(R.id.imageButton10);
    ib.setVisibility(View.VISIBLE);
}

boolean defaultValue1 = false;

SharedPreferences prefs1 = getSharedPreferences("YourAppNamePrefs1",MODE_PRIVATE);
boolean shouldChangeButton1 = prefs1.getBoolean("shouldChangeButton1",defaultValue1);

if (shouldChangeButton1) {
    ImageButton ib1 = (ImageButton) findViewById(R.id.imageButton11);
    ib1.setVisibility(View.VISIBLE);
}

这是另一个事件：

public void onClick7 (View view) {
    Intent myIntent = new Intent(view.getContext(), historiak.class);

    SharedPreferences prefs1 = getSharedPreferences("YourAppNamePrefs1", MODE_PRIVATE);
    prefs1.edit().putBoolean("shouldChangeButton1", true).apply();

    startActivity(myIntent);
    finish();
    MediaPlayer mediaPlayer = MediaPlayer.create(historia20.this, R.raw.dobre);
    mediaPlayer.start();
}

public void onClick8 (View view) {
    Intent myIntent = new Intent(view.getContext(), zemk.class);

    SharedPreferences prefs = getSharedPreferences("YourAppNamePrefs", MODE_PRIVATE);
    prefs.edit().putBoolean("shouldChangeButton", true).apply();

    startActivity(myIntent);
    finish();
    MediaPlayer mediaPlayer = MediaPlayer.create(zem20.this, R.raw.dobre);
    mediaPlayer.start();
}

当我运行此应用程序时，write:unprotunaly应用程序已停止

---

请帮助我

我正在查看您的代码，但我没有看到您启动main活动的任何行

把它改成

public void onClick7 (View view) {
    Intent myIntent = new Intent(view.getContext(), MainActivity.class);

    SharedPreferences prefs1 = getSharedPreferences("YourAppNamePrefs1", MODE_PRIVATE);
    prefs1.edit().putBoolean("shouldChangeButton1", true).apply();

    startActivity(myIntent);
    finish();

}

public void onClick8 (View view) {
    Intent myIntent = new Intent(view.getContext(), MainActivity.class);

    SharedPreferences prefs = getSharedPreferences("YourAppNamePrefs", MODE_PRIVATE);
    prefs.edit().putBoolean("shouldChangeButton", true).apply();

    startActivity(myIntent);
    finish();

}

---

你好，LogCat请问zemk.class或historiak.class在哪里？您启动了此活动，并且希望在MainActivity中进行更改？我想如果您只启动MainActivity，它将起作用。不，这不起作用