Android 增量更新和升级

String srcDir = Environment.getExternalStorageDirectory().toString() + "/DaemonProcess-1.apk";
String destDir1 = Environment.getExternalStorageDirectory().toString() + "/DaemonProcess-2.apk";
String destDir2 = Environment.getExternalStorageDirectory().toString() + "/DaemonProcess-3.apk";
String patchDir = Environment.getExternalStorageDirectory().toString() + "/DaemonProcess.patch";

String appDir = getPackageManager().getApplicationInfo(packageName, 0).sourceDir;

public class DiffUtils {

	static DiffUtils instance;

	public static DiffUtils getInstance() {
		if (instance == null)
			instance = new DiffUtils();
		return instance;
	}

	static {
		System.loadLibrary("ApkPatchLibrary");
	}

	/**
	 * native方法 比较路径为oldPath的apk与newPath的apk之间差异，并生成patch包，存储于patchPath
	 */
	public native int genDiff(String oldApkPath, String newApkPath, String patchPath);
}

public class PatchUtils {

	static PatchUtils instance;

	public static PatchUtils getInstance() {
		if (instance == null)
			instance = new PatchUtils();
		return instance;
	}

	static {
		System.loadLibrary("ApkPatchLibrary");
	}

	/**
	 * native方法 使用路径为oldApkPath的apk与路径为patchPath的补丁包，合成新的apk，并存储于newApkPath
	 */
	public native int patch(String oldApkPath, String newApkPath, String patchPath);
}

private class CopyTask extends AsyncTask<String, Void, Integer> {

        @Override
        protected Integer doInBackground(String... params) {

            for (int i = 0; i < params.length; i += 2) {
                try {
                    File file = new File(params[i]);
                    if (!file.exists())
                        FileUtils.createFile(file);

                    InputStream is;
                    OutputStream os = new FileOutputStream(params[i]);
                    is = getAssets().open(params[i + 1]);
                    byte[] buffer = new byte[1024];
                    int length = is.read(buffer);
                    while (length > 0) {
                        os.write(buffer, 0, length);
                        length = is.read(buffer);
                    }
                    os.flush();
                    is.close();
                    os.close();
                } catch (Exception e) {
                    handler.obtainMessage(1).sendToTarget();
                    return null;
                }
            }
            handler.obtainMessage(0).sendToTarget();
            return null;
        }

        @Override
        protected void onPostExecute(Integer integer) {
            super.onPostExecute(integer);
            loadding.setVisibility(View.GONE);
        }
    }

private class PatchTask extends AsyncTask<String, Void, Integer> {

        @Override
        protected Integer doInBackground(String... params) {

            try {

                int result = PatchUtils.getInstance().patch(srcDir, destDir2, patchDir);
                if (result == 0) {
                    handler.obtainMessage(4).sendToTarget();
                    return WHAT_SUCCESS;
                } else {
                    handler.obtainMessage(5).sendToTarget();
                    return WHAT_FAIL_PATCH;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return WHAT_FAIL_PATCH;
        }

        @Override
        protected void onPostExecute(Integer integer) {
            super.onPostExecute(integer);
            loadding.setVisibility(View.GONE);
        }
    }

  private void install(String dir) {
        String command = "chmod 777 " + dir;
        Runtime runtime = Runtime.getRuntime();
        try {
            runtime.exec(command); // 可执行权限
        } catch (IOException e) {
            e.printStackTrace();
        }

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setDataAndType(Uri.parse("file://" + dir), "application/vnd.android.package-archive");
        startActivity(intent);
    }

服务端工具以及源码位于Server目录下。目前只在Linux64位的系统下编译，其他系统大家可自行编译。Linux下的可直接修改makefile，windows下可用VC编译。

Diff工具：生成差分包

<!--命令             oldApk              newApk              patch-->
./linux-x86_64/Diff DaemonProcess-1.apk DaemonProcess-2.apk dp.patch

Patch工具：合并

<!--命令              oldApk              newApk              patch-->
./linux-x86_64/Patch DaemonProcess-1.apk DaemonProcess-3.apk dp.patch