在自己的app中安装assets目录下的apk文件的方法：
详细过程如下：
public class MainActivity extends Activity {
Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
//Toast.makeText(this, ""+Environment.getExternalStorageDirectory().getAbsolutePath(), 0).show();
if(copyApkFromAssets(this, "test.apk", Environment.getExternalStorageDirectory().getAbsolutePath()+"/test.apk")){
Builder m = new AlertDialog.Builder(mContext)
.setIcon(R.drawable.ic_launcher).setMessage("是否安装？")
.setIcon(R.drawable.ic_launcher)
.setPositiveButton("yes", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(Uri.parse("file://" + Environment.getExternalStorageDirectory().getAbsolutePath()+"/test.apk"),
"application/vnd.android.package-archive");
mContext.startActivity(intent);
}
});
m.show();
}
}
public boolean copyApkFromAssets(Context context, String fileName, String path) {
boolean copyIsFinish = false;
try {
InputStream is = context.getAssets().open(fileName);
File file = new File(path);
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
byte[] temp = new byte[1024];
int i = 0;
while ((i = is.read(temp)) > 0) {
fos.write(temp, 0, i);
}
fos.close();
is.close();
copyIsFinish = true;
} catch (IOException e) {
e.printStackTrace();
}
return copyIsFinish;
}
}
