Android(安卓)动态加载APK--代码安装、获取资源及Intent调用已安装apk
16lz
2021-12-04
最近在研究Android动态加载APK技术,偶有小得,共享一下,欢迎交流。
首先是Android 动态加载已安装的APK
截图:
被调用工程TestB:
其工程已添加了字符串、颜色和图片资源,这里不写了,读者可自行添加。
public class TestBActivity extends Activity{/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);Button button=(Button)findViewById(R.id.button1);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubToast.makeText(TestBActivity.this, "this is testB", Toast.LENGTH_SHORT).show();}});}}
接着把TestB打包为TestB.apk,放到sdcard的根目录。
首先应该是安装apk文件:
protected void InstallAPK(String apkname) {// TODO Auto-generated method stub//代码安装String fileName = Environment.getExternalStorageDirectory() + "/"+apkname; Intent intent = new Intent(Intent.ACTION_VIEW); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);// intent.setDataAndType(Uri.parse("file://"+fileName), "application/vnd.android.package-archive"); intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive"); TestAActivity.this.startActivityForResult(intent, 1);
但是安装之前是不是要先检测一下TestB.apk是否已安装呢:
protected boolean checkInstall(String pak) {// TODO Auto-generated method stubboolean install=false;PackageManager pm=getPackageManager();try {PackageInfo info=pm.getPackageInfo(pak,1);if (info!=null&&info.activities.length>0) {install=true;}} catch (NameNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}return install;}
如果未安装,便调用InstallAPK(String apkname)安装,如果已安装便可代码获取其资源:
private void getRes(String pak){if (checkInstall(pak)) {try {Context ctxTestB = getTestContext(pak);Resources res = ctxTestB.getResources();// 获取字符串stringString hello = res.getString(getId("string", "hello", pak));((TextView) findViewById(R.id.testb_string)).setText(hello);// 获取图片DrawableDrawable drawable = res.getDrawable(getId("drawable", "testb",pak));((ImageView) findViewById(R.id.testb_drawable)).setImageDrawable(drawable);// 获取颜色值int color = res.getColor(getId("color", "white",pak));((TextView) findViewById(R.id.testb_color)).setBackgroundColor(color);// 获取布局文件View view = getView(ctxTestB, getId("layout", "main",pak));LinearLayout layout = (LinearLayout) findViewById(R.id.testb_layout);layout.addView(view);} catch (NameNotFoundException e) {e.printStackTrace();}}} //获取资源对应的编号private int getId(String name, String type,String pak) {return testb.getIdentifier(name, type, pak);} // 获取视图public View getView(Context ctx, int id) {return ((LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(id,null);} //获取TestB的Contextprivate Context getTestContext(String pak) throws NameNotFoundException {return createPackageContext(pak,Context.CONTEXT_IGNORE_SECURITY | Context.CONTEXT_INCLUDE_CODE);}
接下来再来看看怎么使用Intent组件启动被调用工程:
protected void startAPK(String pak) {// TODO Auto-generated method stub//代码启动try { //pak=PACKAGE_TEST_B+".TestBActivity"ContextctxTestB = getTestContext(PACKAGE_TEST_B);Class cls = ctxTestB.getClassLoader().loadClass(pak);TestAActivity.this.startActivity(new Intent(ctxTestB, cls));} catch (ClassNotFoundException e) {e.printStackTrace();} catch (NameNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
以下为扩展内容:
比如加上网络下载apk文件功能,然后再安装,这里使用的是URL通信协议,用HttpURLConnection类,面向的是应用层:
protected File downLoadFile(String httpUrl) { // TODO Auto-generated method stubString filename="down_TestB.apk";File file=new File(Environment.getExternalStorageDirectory() + "/"+filename); try { URL url = new URL(httpUrl); try { HttpURLConnection conn = (HttpURLConnection) url .openConnection(); InputStream is = conn.getInputStream(); FileOutputStream fos = new FileOutputStream(file); byte[] buf = new byte[256]; conn.connect(); int count = 0; if (conn.getResponseCode()==200) { while ((count=is.read(buf))>0) { fos.write(buf, 0, count);} } conn.disconnect(); fos.close(); is.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return file; }
此工程还可扩展,比如获取未安装apk或者已安装apk的版本、图标等资源,和已安装的apk进行版本比较,以确定是否要升级新版本。关于此可以看下我的另一篇博文《Android获取未安装和已安装apk的版本、图标等资源》。
Ok,到此结束,本人QQ:957411207,欢迎交流。
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