将app变为桌面程序，开机后不再显示原桌面，而是显示我们的app界面

步骤一：在项目清单跟节点加入android:installLocation="internalOnly",指定你的app安装到内存中。

步骤二：在第一个要启动的activity的filter中加入，让app成为主程序。

！！！！！！！！！完工！！！！！！！！！！！

Android默认桌面设置终级大招

最近研究桌面程序开发，遇到一个难题，就是按Home键没法选择自己的桌面作为默认桌面，经过一番辛苦的查找组合，终于从各个旮旯挖出代码，然后组合修改，调试，终于修成正果。各位看官，直接看代码：

import android.app.Activity;import android.app.WallpaperManager;import android.content.BroadcastReceiver;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;import android.graphics.Color;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.provider.Contacts;import android.provider.Settings;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.widget.GridLayout;import android.text.SpannableString;import android.text.Spanned;import android.text.style.RelativeSizeSpan;import android.text.style.SuperscriptSpan;import android.util.DisplayMetrics;import android.util.Log;import android.util.TypedValue;import android.view.KeyEvent;import android.view.View;import android.view.WindowManager;import android.widget.DigitalClock;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;import com.disney.sclocker.R;import com.disney.sclocker.alarm.ClockAlarmActivity;import com.disney.sclocker.locker.ScreenLockService;import com.disney.sclocker.util.Utils;import com.disney.sclocker.widget.DisneyAnalogClockV1;import com.disney.sclocker.widget.GuideViewPager;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.List;public class DesktopActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_desktop);        //HOME键侦测    IntentFilter homeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);    registerReceiver(homeReceiver, homeFilter);    Log.d("123", "android.os.Build.MANUFACTURER=" + android.os.Build.MANUFACTURER);}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {    switch (keyCode) {        case KeyEvent.KEYCODE_BACK:            return true;        case KeyEvent.KEYCODE_HOME:            return true;    }    return super.onKeyDown(keyCode, event);}//Home键侦测---[----private final BroadcastReceiver homeReceiver = new BroadcastReceiver() {    final String SYS_KEY = "reason"; // 标注下这里必须是这么一个字符串值    final String SYS_HOME_KEY = "homekey";// 标注下这里必须是这么一个字符串值    @Override    public void onReceive(Context context, Intent intent) {        String action = intent.getAction();        if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {            String reason = intent.getStringExtra(SYS_KEY);            if (reason != null && reason.equals(SYS_HOME_KEY)) {                Log.i("TT", "home键监听");                String currentHome = getHomeLauncher();                Log.i("TT", "currentHome="+currentHome);                if (isDefaultHome()) {                    return;                }                setDefaultL();            }        }    }};private void setDefaultL(){    Intent intent = new Intent(Intent.ACTION_MAIN);    intent.addCategory("android.intent.category.HOME");    try {        intent.setComponent(new ComponentName("android","com.android.internal.app.ResolverActivity"));        startActivity(intent);    }catch (Exception e){//这里就是为了处置华为手机的        try {            intent.setComponent(new ComponentName("com.huawei.android.internal.app", "com.huawei.android.internal.app.HwResolverActivity"));//这个类有些华为手机找不到            startActivity(intent);        } catch (Exception e1){            e1.printStackTrace();            try {                startHuaweiSettingActOfDefLauncher();//开启桌面设置            }catch(Exception e2){                e2.printStackTrace();                intent = new Intent(Settings.ACTION_APPLICATION_SETTINGS);//还不行，就只能应用程序设置了                startActivity(intent);            }        }    }}/** * 判断自己是否为默认桌面 */public final boolean isDefaultHome() {    Intent intent = new Intent(Intent.ACTION_MAIN);//Intent.ACTION_VIEW    intent.addCategory("android.intent.category.HOME");    intent.addCategory("android.intent.category.DEFAULT");    PackageManager pm = getPackageManager();    ResolveInfo info = pm.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);    boolean isDefault = getPackageName().equals(info.activityInfo.packageName);    return isDefault;}public void startHuaweiSettingActOfDefLauncher() {    IntentFilter localIntentFilter = new IntentFilter();    localIntentFilter.addAction(Intent.ACTION_MAIN);//"android.intent.action.MAIN"    localIntentFilter.addCategory(Intent.CATEGORY_HOME);//"android.intent.category.HOME"    Intent localIntent3 = new Intent(localIntentFilter.getAction(0));    localIntent3.addCategory(localIntentFilter.getCategory(0));    Intent localIntent4 = new Intent();    localIntent4.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);    localIntent4.setClassName("com.android.settings", "com.android.settings.Settings$PreferredSettingsActivity");    localIntent4.putExtra("preferred_app_package_name", getPackageName());    localIntent4.putExtra("preferred_app_class_name", DesktopActivity.class.getName());    localIntent4.putExtra("is_user_confirmed", true);    localIntent4.putExtra("preferred_app_intent", localIntent3);    localIntent4.putExtra("preferred_app_intent_filter", localIntentFilter);    localIntent4.putExtra("preferred_app_label", "默认桌面设置");    startActivity(localIntent4);}private String getHomeLauncher() {    Intent intent = new Intent(Intent.ACTION_MAIN);    intent.addCategory(Intent.CATEGORY_HOME);    ResolveInfo resolveInfo = getPackageManager().resolveActivity(intent, 0);    String currentHomePackage = resolveInfo.activityInfo.packageName;    return currentHomePackage;}@Overrideprotected void onDestroy() {    unregisterReceiver(homeReceiver);    super.onDestroy();}}

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