在應用程序中選擇背景圖片

Question

我想要的。 我目前有一個問題，爲我的應用程序設置背景。我想要的是一個頁面，選擇應用程序用戶選擇的壁紙/背景。一旦他們通過點擊圖像視圖選擇了想要的背景，整個應用程序就應該使用圖像作爲背景。就是這樣。

我做了什麼。 我創建了一個具有2個ImageView作爲可用壁紙選項的活動，並在用戶點擊它們時指定圖像視圖來設置背景圖像。現在的問題是我不知道如何保存設置並將其應用於我的項目中的所有其他活動。

XML

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
android:id="@+id/settingscreen" 
tools:context="com.example.naris.auin.SettingsActivity"> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="Background Selector" 
    android:id="@+id/textViewBackgroundSelector" 
    android:layout_below="@+id/switchNightMode" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginTop="38dp" /> 

<ImageView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/imageViewBackground1" 
    android:layout_marginLeft="23dp" 
    android:layout_marginStart="23dp" 
    android:src="@drawable/rateicon" 
    android:layout_centerVertical="true" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" /> 

<ImageView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/imageViewBackground2" 
    android:layout_centerVertical="true" 
    android:layout_toRightOf="@+id/textViewBackgroundSelector" 
    android:layout_toEndOf="@+id/textViewBackgroundSelector" 
    android:layout_marginLeft="36dp" 
    android:layout_marginStart="36dp" 
    android:src="@drawable/ic_launcher" /> 
</RelativeLayout> 

設置活動

public class SettingsActivity extends AppCompatActivity { 



@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_settings); 

    final RelativeLayout Settingscreen = (RelativeLayout) findViewById(R.id.settingscreen); 





    ImageView ImageViewBackground1 = (ImageView) findViewById(R.id.imageViewBackground1); 
    ImageView ImageViewBackground2 = (ImageView) findViewById(R.id.imageViewBackground2); 

    ImageViewBackground1.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 

      Settingscreen.setBackgroundResource(R.drawable.faqicon); 

     } 
    }); 

    ImageViewBackground2.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 

      Settingscreen.setBackgroundResource(R.drawable.rateicon); 

     } 
    }); 

} 

public boolean onKeyDown(int keyCode, KeyEvent event) { 

    if(keyCode == android.view.KeyEvent.KEYCODE_BACK) 
    { 
     startActivity(new Intent(SettingsActivity.this, 
       MainActivity.class)); 
     finish(); 
    } 
    return false; 
}; 

} 

預先感謝。

Answer 1

public class SettingsActivity extends AppCompatActivity { 

private static final String PREF_NAME = "nextage_quiz"; 
private static final int PRIVATE_MODE = 0; 

SharedPreferences getPrefs; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_settings); 

    getPrefs = this.getSharedPreferences(PREF_NAME, PRIVATE_MODE); 
    final RelativeLayout Settingscreen = (RelativeLayout) findViewById(R.id.settingscreen); 

    ImageView ImageViewBackground1 = (ImageView) findViewById(R.id.imageViewBackground1); 
    ImageView ImageViewBackground2 = (ImageView) findViewById(R.id.imageViewBackground2); 

    ImageViewBackground1.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 

      Settingscreen.setBackgroundResource(R.drawable.faqicon); 
      getPrefs.edit().putInt("id", R.drawable.faqicon).apply(); 
     } 
    }); 

    ImageViewBackground2.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 

      Settingscreen.setBackgroundResource(R.drawable.rateicon); 
      getPrefs.edit().putInt("id", R.drawable.faqicon).apply(); 
     } 
    }); 
} 

MainActivity：

public class MainActivity extends AppCompatActivity { 

    private static final String PREF_NAME = "nextage_quiz"; 
    private static final int PRIVATE_MODE = 0; 

    SharedPreferences getPrefs; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     getPrefs = this.getSharedPreferences(PREF_NAME, PRIVATE_MODE); 

     ImageView background= (ImageView) findViewById(R.id.background); 
     if(getPrefs.getInt("id",0) != 0) 
      background.setBackgroundResource(getPrefs.getInt("id",0)); 

    } 

Upadate：使用這些變量

 private static final String PREF_NAME = "nextage_quiz"; 
     private static final int PRIVATE_MODE = 0; 

     SharedPreferences getPrefs; 

Answer 2

你應該使用Preferences來做到這一點。 看到鏈接瞭解更多詳情... https://developer.android.com/guide/topics/ui/settings.html