Android安装应用和跳转应用简单记录

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http://blog.csdn.net/qq_27512671/article/details/70224978

安装应用代码 7.0上
首先在AndroidManifest.xml文件，activity同级节点注册provider：

<provider            android:name="android.support.v4.content.FileProvider"            android:authorities="${applicationId}.file_provider"            android:exported="false"            android:grantUriPermissions="true">            <meta-data                android:name="android.support.FILE_PROVIDER_PATHS"                android:resource="@xml/file_paths" />    </provider>

将apk文件下载到此路径：

String cachePath = (
getExternalFilesDir(“upgrade_apk”) +
File.separator +
getPackageName() +
“.apk”);

在res目录xml文件夹下创建名为file_paths的文件：upgrade_apk代表上面保存路径的文件夹名称，可随意更改，相同即可。

<?xml version="1.0" encoding="utf-8"?><paths>    <external-files-path name="bga_upgrade_apk" path="upgrade_apk" />    最好使用下面的,代表意思应该是任何目录下都可以访问    <external-path path="." name="external_storage_root" /></paths>

 /** 安装 apk 文件*/            public void installApk(File apkFile) {                Intent installApkIntent = new Intent();                installApkIntent.setAction(Intent.ACTION_VIEW);                installApkIntent.addCategory(Intent.CATEGORY_DEFAULT);                installApkIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {                    installApkIntent.setDataAndType(FileProvider.getUriForFile(getApplicationContext(), "com.apkinstall.demo.file_provider", apkFile), "application/vnd.android.package-archive");                    installApkIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);                } else {                    installApkIntent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");                }                if (getPackageManager().queryIntentActivities(installApkIntent, 0).size() > 0) {                    startActivity(installApkIntent);                }            }

一般跳转别的应用代码示例:

if (APPUtils.isAppInstall(mContext, "com.whatsapp")) { //判断是否装了whatsAPP            Intent sendIntent = new Intent();            sendIntent.setAction(Intent.ACTION_SEND);            sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");            sendIntent.setType("text/plain");            sendIntent.setPackage("com.whatsapp");//区别别的应用包名            mContext.startActivity(sendIntent);        }else {            ToastUtils.showToast("你还没安装whatsAPP");        }

 public static boolean isAppInstall(Context context,String appName) {        PackageInfo packageInfo = null ;        try {            packageInfo = context.getPackageManager().getPackageInfo(appName, 0);        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        return packageInfo==null?false:true;    }

跳转到别的应用的指定的Activity

 try {                      PackageInfo packageInfo=getPackageManager().getPackageInfo("com.anqiansong.customview", 0);                      if(packageInfo==null) {                    return;                    }                    ComponentName comp = new ComponentName("com.anqiansong.customview","com.anqiansong.customview.MainActivity");                      Intent intent=new Intent();                      intent.setComponent(comp);                      intent.setAction("android.intent.action.VIEW");                      startActivity(intent);                  } catch (NameNotFoundException e) {                      //没有安装该程序                      Intent intent = new Intent(Intent.ACTION_VIEW);                       File apk=copyApkFromAssets("CustomView.apk");                      intent.setDataAndType(Uri.fromFile(apk),                                "application/vnd.android.package-archive");                        MainActivity.this.startActivity(intent);                    }

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