1. Use Google Play to find safe apps
We do a lot behind the scenes to review apps before they can be published on Google Play, so even before you install an app, Google uses a variety of methods to check that developers are complying with our policies. If an app violates those policies, it is blocked from Play and sometimes the developer is too. Apps that are considered to be potentially harmful are blocked and flagged for a manual review by members of the Android Security Team. To learn more about this review process and how Android continues to keep your device safe even after you download an app, read our recently published whitepaperThe app review process before it can be added to Google Play | Source: Official Android Blog