Android判断应用是否存在
通过包名判断
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Intent intent = new Intent(Intent.ACTION_VIEW);intent.setClassName("com.android.settings", //$NON-NLS-1$"com.android.settings.InstalledAppDetails"); //$NON-NLS-1$intent.putExtra("com.android.settings.ApplicationPkgName", //$NON-NLS-1$mCurrentPkgName);List<ResolveInfo> acts = getPackageManager().queryIntentActivities(intent, 0);if (acts.size() > 0) {startActivity(intent);} else {Toast.makeText(this,getString(R.string.failed_to_resolve_activity),Toast.LENGTH_SHORT).show();}
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