Launcher

参考博客：

https://www.cnblogs.com/rayray/p/3408107.html

参考android的源码的地址：

http://androidxref.com/source/xref/packages/apps/Launcher2/src/com/android/launcher2/DragLayer.java

package bjpkten.mylauncher;import android.content.Intent;import android.content.pm.ResolveInfo;import android.os.Bundle;import android.support.annotation.NonNull;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import java.util.List;public class MainActivity extends AppCompatActivity {    private RecyclerView mRecyclerView;    private List mApps;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);        initData();        mRecyclerView.setAdapter(new MyRecyclerViewAdapter());        mRecyclerView.setLayoutManager(new GridLayoutManager(this,3));    }    public void initData(){        Intent intent = new Intent(Intent.ACTION_VIEW,null);        intent.addCategory(Intent.CATEGORY_DEFAULT);        mApps = getPackageManager().queryIntentActivities(intent, 0);    }    class MyViewHolder extends RecyclerView.ViewHolder{        ImageView imageView;        public MyViewHolder(View itemView) {            super(itemView);            imageView = (ImageView) itemView.findViewById(R.id.imageView);        }    }    class MyRecyclerViewAdapter extends RecyclerView.Adapter{        @NonNull        @Override        public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_icon, null);            return new MyViewHolder(view);        }        @Override        public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) {                myViewHolder.imageView.setImageDrawable(mApps.get(i).loadIcon(getPackageManager()));        }        @Override        public int getItemCount() {            return mApps.size();        }    }}

item_icon.xml:

<?xml version="1.0" encoding="utf-8"?>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

更多相关文章

随机推荐