Android 动态加载APK--代码安装、获取资源及Intent调用已安装apk .
16lz
2021-01-23
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。
[java] view plain copy print ?- publicclassTestBActivityextendsActivity{
- /**Calledwhentheactivityisfirstcreated.*/
- @Override
- publicvoidonCreate(BundlesavedInstanceState){
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- Buttonbutton=(Button)findViewById(R.id.button1);
- button.setOnClickListener(newOnClickListener(){
- @Override
- publicvoidonClick(Viewv){
- //TODOAuto-generatedmethodstub
- Toast.makeText(TestBActivity.this,"thisistestB",Toast.LENGTH_SHORT).show();
- }
- });
- }
- }
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。
调用工程TestA:
首先应该是安装apk文件:
[java] view plain copy print ?- protectedvoidInstallAPK(Stringapkname){
- //TODOAuto-generatedmethodstub
- //代码安装
- StringfileName=Environment.getExternalStorageDirectory()+"/"+apkname;
- Intentintent=newIntent(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(newFile(fileName)),"application/vnd.android.package-archive");
- TestAActivity.this.startActivityForResult(intent,1);
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:
[java] view plain copy print ?- protectedbooleancheckInstall(Stringpak){
- //TODOAuto-generatedmethodstub
- booleaninstall=false;
- PackageManagerpm=getPackageManager();
- try{
- PackageInfoinfo=pm.getPackageInfo(pak,1);
- if(info!=null&&info.activities.length>0){
- install=true;
- }
- }catch(NameNotFoundExceptione){
- //TODOAuto-generatedcatchblock
- e.printStackTrace();
- }
- returninstall;
- }
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:
[java] view plain copy print ?- privatevoidgetRes(Stringpak){
- if(checkInstall(pak)){
- try{
- ContextctxTestB=getTestContext(pak);
- Resourcesres=ctxTestB.getResources();
- //获取字符串string
- Stringhello=res.getString(getId("string","hello",pak));
- ((TextView)findViewById(R.id.testb_string)).setText(hello);
- //获取图片Drawable
- Drawabledrawable=res.getDrawable(getId("drawable","testb",pak));
- ((ImageView)findViewById(R.id.testb_drawable)).setImageDrawable(drawable);
- //获取颜色值
- intcolor=res.getColor(getId("color","white",pak));
- ((TextView)findViewById(R.id.testb_color)).setBackgroundColor(color);
- //获取布局文件
- Viewview=getView(ctxTestB,getId("layout","main",pak));
- LinearLayoutlayout=(LinearLayout)findViewById(R.id.testb_layout);
- layout.addView(view);
- }catch(NameNotFoundExceptione){
- e.printStackTrace();
- }}
- }
- //获取资源对应的编号
- privateintgetId(Stringname,Stringtype,Stringpak){
- returntestb.getIdentifier(name,type,pak);
- }
- //获取视图
- publicViewgetView(Contextctx,intid){
- return((LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(id,null);
- }
- //获取TestB的Context
- privateContextgetTestContext(Stringpak)throwsNameNotFoundException{
- returncreatePackageContext(pak,Context.CONTEXT_IGNORE_SECURITY|Context.CONTEXT_INCLUDE_CODE);
- }
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:
- protectedvoidstartAPK(Stringpak){
- //TODOAuto-generatedmethodstub
- //代码启动
- try{
- //pak=PACKAGE_TEST_B+".TestBActivity"
- ContextctxTestB=getTestContext(PACKAGE_TEST_B);
- Classcls=ctxTestB.getClassLoader().loadClass(pak);
- TestAActivity.this.startActivity(newIntent(ctxTestB,cls));
- }catch(ClassNotFoundExceptione){
- e.printStackTrace();
- }catch(NameNotFoundExceptione){
- //TODOAuto-generatedcatchblock
- e.printStackTrace();
- }
- }
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:
[java] view plain copy print ?- protectedFiledownLoadFile(StringhttpUrl){
- //TODOAuto-generatedmethodstub
- Stringfilename="down_TestB.apk";
- Filefile=newFile(Environment.getExternalStorageDirectory()+"/"+filename);
- try{
- URLurl=newURL(httpUrl);
- try{
- HttpURLConnectionconn=(HttpURLConnection)url
- .openConnection();
- InputStreamis=conn.getInputStream();
- FileOutputStreamfos=newFileOutputStream(file);
- byte[]buf=newbyte[256];
- conn.connect();
- intcount=0;
- if(conn.getResponseCode()==200){
- while((count=is.read(buf))>0){
- fos.write(buf,0,count);
- }
- }
- conn.disconnect();
- fos.close();
- is.close();
- }catch(IOExceptione){
- //TODOAuto-generatedcatchblock
- e.printStackTrace();
- }
- }catch(MalformedURLExceptione){
- //TODOAuto-generatedcatchblock
- e.printStackTrace();
- }
- returnfile;
- }
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。
原文地址:http://blog.csdn.net/zhang957411207/article/details/7581070
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