在应用程序中选择背景图像

Question

我想要的。 我目前在为我的应用程序设置背景时遇到问题。我想要的是一个可供应用用户选择的壁纸/背景选择页面。一旦他们通过单击图像视图选择了所需的背景，整个应用程序应该使用该图像作为他们的背景。就是这样。

我做了什么。 我创建了一个活动，它有 2 个 ImageView 作为可用壁纸的选择，并分配图像视图以在用户单击它们时设置背景图像。现在的问题是我不知道如何保存设置并将其应用于项目中的所有其他活动。

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>

设置活动

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;
};

}

提前致谢。

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));

    }

更新：使用这些变量

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

        SharedPreferences getPrefs;

Answer 2

您应该使用首选项来执行此操作。 请参阅链接查看更多细节... https://developer.android.com/guide/topics/ui/settings.html