Android SharedPreferences使用

最新推荐文章于 2025-09-14 20:08:05 发布

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本文介绍了一个用于设置Android设备上摄像头默认像素的广播接收器。通过使用SharedPreferences，此接收器能够根据不同条件设定两种不同分辨率（1600x1200和2560x1920）作为摄像头的默认分辨率。

使用SharedPreferences设置摄像头默认像素

package com.android.camera;

import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Camera.CameraInfo;
import android.util.Log;
import android.content.SharedPreferences;
import android.os.SystemProperties;

// We want to disable camera-related activities if there is no camera. This
// receiver runs when BOOT_COMPLETED intent is received. After running once
// this receiver will be disabled, so it will not run again.

public class ResetCameraSettingsReceiver extends BroadcastReceiver {

private ComboPreferences mPreferences;

String str_16M = "1280x960";
String str_20M = "1600x1200";
String str_24M = "2560x1920";

@Override
public void onReceive(Context context, Intent intent) {
mPreferences = new ComboPreferences(context);
if(SystemProperties.get("persist.sys.selcusanim").equals("27")) {
SharedPreferences cameraPref = mPreferences.getSharedPreference(context, 0);
SharedPreferences.Editor editor = cameraPref.edit();
editor.putString("pref_camera_picturesize_ratio_key", "1.3333");
editor.putString("pref_camera_picturesize_key", str_16M);
editor.apply();

SharedPreferences cameraPref1 = mPreferences.getSharedPreference(context, 1);
SharedPreferences.Editor editor1 = cameraPref1.edit();
editor1.putString("pref_camera_picturesize_ratio_key", "1.3333");
editor1.putString("pref_camera_picturesize_key", str_20M);
editor1.apply();
} else {
SharedPreferences cameraPref = mPreferences.getSharedPreference(context, 0);
SharedPreferences.Editor editor = cameraPref.edit();
editor.putString("pref_camera_picturesize_ratio_key", "1.3333");
editor.putString("pref_camera_picturesize_key", str_20M);
editor.apply();

2.读取SharedPreferences中的值

SharedPreferences cameraPref1 = mPreferences.getSharedPreference(context, 1);
String ratio=cameraPref1.getString("pref_camera_picturesize_ratio_key"."1.3333");