void startFit(String packageName) { PackageManager packageManager = this.getApplicationContext().getPackageManager(); PackageInfo pi = null; try { pi = packageManager.getPackageInfo(packageName, 0); if(pi == null) { Toast.makeText(FullscreenLauncher.this, "应用未安装", Toast.LENGTH_SHORT).show(); return; } } catch (PackageManager.NameNotFoundException e) { } Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null); resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER); resolveIntent.setPackage(pi.packageName); List<ResolveInfo> apps = packageManager.queryIntentActivities(resolveIntent, 0); ResolveInfo ri = apps.iterator().next(); if (ri != null ) { String className = ri.activityInfo.name; Intent intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_LAUNCHER); ComponentName cn = new ComponentName(packageName, className); intent.setComponent(cn); this.getApplicationContext().startActivity(intent); } }