android 根据apk文件获取包名等信息已经判断指定这个apk 是否安装过

http://blog.163.com/benben_long/blog/static/1994582432014219104154971/

比如sd卡里有一个apk文件，可以根据这个apk文件得到他的包名及版本等一切信息。

package com.example.test;

import com.example.androidgametest.R;

import android.app.Activity;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Environment;
import android.widget.TextView;

public class test extends Activity{
private TextView mTvTest;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.test);

  mTvTest=(TextView) findViewById(R.id.tv_test);

  PackageManager pm = this.getPackageManager();
        PackageInfo info = pm.getPackageArchiveInfo(Environment.getExternalStorageDirectory()+"/TianjinPlugin3.apk", PackageManager.GET_ACTIVITIES);
        ApplicationInfo appInfo = null;
        if (info != null) {
            appInfo = info.applicationInfo;
            String packageName = appInfo.packageName;
            mTvTest.setText(packageName);
        }

}

}

因为要从SD卡读这个apk，所以千万别忘了添加权限permission.READ_EXTERNAL_STORAGE

http://blog.csdn.net/chuxing/article/details/7219057

android 判断程序是否安装

1,根据包名判断

public boolean checkApkExist(Context context, String packageName) { if (packageName == null || “”.equals(packageName)) return false; try { ApplicationInfo info = context.getPackageManager() .getApplicationInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES); return true; } catch (NameNotFoundException e) { return false; } } 2. 根据Intent判断 public boolean checkApkExist(Context context, Intent intent) { List list = context.getPackageManager().queryIntentActivities(intent, 0); if(list.size() > 0){ return true; } return false; } public boolean checkApkExist(Context context, String packageName) { if (packageName == null || “”.equals(packageName)) return false; try { ApplicationInfo info = context.getPackageManager() .getApplicationInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES); return true; } catch (NameNotFoundException e) { return false; } } public boolean checkApkExist(Context context, Intent intent) {
  List list = context.getPackageManager()
    .queryIntentActivities(intent, 0);
  if (list.size() > 0) {
   return true;
  }
  return false;
}

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