android自定义桌面应用

这篇文章主要讲下自定义桌面应用.

效果主要是调用packageManager来获取当前所有的程序,并在自定义桌面程序中展示,并支持跳转.

主要的代码如下:

1.manifest声明

   <activity android:name=".MainActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.HOME" /><category android:name="android.intent.category.DEFAULT" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity>

2: 创建adapter

package com.test.luanchertest;import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;import java.util.List;/*** @Author: zh* @Time: 23-11-27.* @Email:* @Describe:*/
public class LauncherAdapter extends BaseAdapter {private List<ResolveInfo> mApps;private PackageManager mPackageManager;private Context context;public LauncherAdapter(Context context) {this.context = context;mPackageManager = context.getPackageManager();Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);mApps = mPackageManager.queryIntentActivities(mainIntent, 0);}@Overridepublic int getCount() {return mApps.size();}@Overridepublic Object getItem(int i) {return mApps.get(i);}@Overridepublic long getItemId(int i) {return i;}@Overridepublic View getView(int i, View view, ViewGroup viewGroup) {if (view == null) {view = LayoutInflater.from(context).inflate(R.layout.item_launcher, viewGroup, false);}ResolveInfo info = mApps.get(i);ImageView icon = (ImageView) view.findViewById(R.id.item_icon);TextView label = (TextView) view.findViewById(R.id.item_label);icon.setImageDrawable(info.loadIcon(mPackageManager));label.setText(info.loadLabel(mPackageManager));String packageName = info.activityInfo.packageName;Log.e("xxxxxxx", "getView: "+packageName );Intent launchIntent = mPackageManager.getLaunchIntentForPackage(packageName);icon.setOnClickListener(v -> context.startActivity(launchIntent));label.setOnClickListener(v -> context.startActivity(launchIntent));return view;}
}

3: 创建item布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"xmlns:app="http://schemas.android.com/apk/res-auto"><ImageViewandroid:id="@+id/item_icon"android:layout_width="48dp"android:layout_height="48dp"android:scaleType="centerCrop"android:layout_gravity="center_horizontal"android:layout_margin="10dp"/><TextViewandroid:id="@+id/item_label"android:layout_width="wrap_content"android:layout_height="wrap_content"android:textSize="12sp"android:textColor="#000000"android:text="xxxx"android:layout_gravity="center_horizontal"/>
</LinearLayout>

4: mainAcitivty处理

public class MainActivity extends AppCompatActivity {private GridView gridView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);gridView =findViewById(R.id.launcher_grid);gridView.setAdapter(new LauncherAdapter(this));}
}

主布局:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><GridViewandroid:layout_width="match_parent"android:layout_height="match_parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"android:id="@+id/launcher_grid"android:numColumns="3"/>
</androidx.constraintlayout.widget.ConstraintLayout>