Fix app install flow

A regression was introduced when we added support for
installing apps from content URIs. Since we stage the
APK in the cache folder we changed the flow to wipe
the cached version when the PackageInstallerActivity
finishes or gets an installation result, so we started
the InstallAppProgress activity for result but the latter
may be called with the forward result flag which is
incompatible with start activity for result. This change
delegates clearing the staging file in the cache folder
to the InstallAppProgress activity.

bug:28551937

Change-Id: I0d9978aff60b7fab6b64fe7bf889ef30f9b2fd7c

src/com/android/packageinstaller/InstallAppProgress.java

@@ -34,7 +34,6 @@ import android.content.pm.PackageInstaller;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.ResolveInfo;
-import android.graphics.drawable.LevelListDrawable;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
@@ -94,7 +93,7 @@ public class InstallAppProgress extends Activity implements View.OnClickListener
                         setResult(msg.arg1 == PackageInstaller.STATUS_SUCCESS
                                 ? Activity.RESULT_OK : Activity.RESULT_FIRST_USER,
                                         result);
-                        finish();
+                        clearCachedApkIfNeededAndFinish();
                         return;
                     }
                     // Update the status text
@@ -206,6 +205,11 @@ public class InstallAppProgress extends Activity implements View.OnClickListener
         initView();
     }
 
+    @Override
+    public void onBackPressed() {
+        clearCachedApkIfNeededAndFinish();
+    }
+
     @SuppressWarnings("deprecation")
     @Override
     public Dialog onCreateDialog(int id, Bundle bundle) {
@@ -220,13 +224,13 @@ public class InstallAppProgress extends Activity implements View.OnClickListener
                             //launch manage applications
                             Intent intent = new Intent("android.intent.action.MANAGE_PACKAGE_STORAGE");
                             startActivity(intent);
-                            finish();
+                            clearCachedApkIfNeededAndFinish();
                         }
                     })
                     .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                         public void onClick(DialogInterface dialog, int which) {
                             Log.i(TAG, "Canceling installation");
-                            finish();
+                            clearCachedApkIfNeededAndFinish();
                         }
                     })
                     .setOnCancelListener(this)
@@ -370,14 +374,27 @@ public class InstallAppProgress extends Activity implements View.OnClickListener
             if (mAppInfo.packageName != null) {
                 Log.i(TAG, "Finished installing "+mAppInfo.packageName);
             }
-            finish();
+            clearCachedApkIfNeededAndFinish();
         } else if(v == mLaunchButton) {
             startActivity(mLaunchIntent);
-            finish();
+            clearCachedApkIfNeededAndFinish();
         }
     }
 
     public void onCancel(DialogInterface dialog) {
+        clearCachedApkIfNeededAndFinish();
+    }
+
+    private void clearCachedApkIfNeededAndFinish() {
+        // If we are installing from a content:// the apk is copied in the cache
+        // dir and passed in here. As we aren't started for a result because our
+        // caller needs to be able to forward the result, here we make sure the
+        // staging file in the cache dir is removed.
+        if ("file".equals(mPackageURI.getScheme()) && mPackageURI.getPath() != null
+                && mPackageURI.getPath().startsWith(getCacheDir().toString())) {
+            File file = new File(mPackageURI.getPath());
+            file.delete();
+        }
         finish();
     }
 }

src/com/android/packageinstaller/PackageInstallerActivity.java

@@ -72,7 +72,6 @@ public class PackageInstallerActivity extends Activity implements OnCancelListen
     private static final String TAG = "PackageInstaller";
 
     private static final int REQUEST_ENABLE_UNKNOWN_SOURCES = 1;
-    private static final int REQUEST_INSTALL_PACKAGE = 2;
 
     private static final String SCHEME_FILE = "file";
     private static final String SCHEME_CONTENT = "content";
@@ -324,7 +323,6 @@ public class PackageInstallerActivity extends Activity implements OnCancelListen
         if (request == REQUEST_ENABLE_UNKNOWN_SOURCES && result == RESULT_OK) {
             initiateInstall();
         }
-        clearCachedApkIfNeededAndFinish();
     }
 
     private boolean isInstallRequestFromUnknownSource(Intent intent) {
@@ -684,7 +682,8 @@ public class PackageInstallerActivity extends Activity implements OnCancelListen
             newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
         }
         if(localLOGV) Log.i(TAG, "downloaded app uri="+mPackageURI);
-        startActivityForResult(newIntent, REQUEST_INSTALL_PACKAGE);
+        startActivity(newIntent);
+        finish();
     }
 
     private void clearCachedApkIfNeededAndFinish() {