Android projects use their package names as unique identifiers. If two applications with the same package name are installed on the same mobile phone, the latter will overwrite the previously installed applications. In order to prevent the AndroidAPP from being overwritten at will, Android requires the APP to be signed.

How to sign a contract on an Android phone?

First, the other party should turn the contract text into an electronic document and send the electronic document to your mobile phone or email address. Then you can operate it on your mobile phone and use the input method provided on your mobile phone to sign it, which is the same as a normal paper signature. Just sign your name where he asks for it, and write down the year, month and day.

How to write a mobile word document by hand?

The specific steps are as follows:

1. Download and install wpsoffice, and start wpsoffice.

2. Find the file to be signed and open it.

3. After entering, click Edit to open the edit mode.

4. Click the first button in the toolbar below.

5. Hold down the navigation key and drag to the left to display the brush options, and then click the brush.

6. Select the brush, color and line thickness.

7. Sign the corresponding position of the document.

8. Click on the top left corner to finish after signing.

9. Click Save to complete the signature.

How to deal with the failure of signing the Android brush package?

Android signature failure is caused by the following reasons:

1. An application with the same package name is installed on the mobile phone. 2. The current mobile phone operating system does not meet the system version required by the package. 3. The storage space of the mobile phone is insufficient. 4. The installation package has been damaged. Solution:

1. Check whether the machine is installed. If so, uninstall directly. 2. Check whether the package version is consistent with the current mobile phone. 3. Uninstall some useless or rarely used applications of the mobile phone to free up the storage space of the mobile phone. 4. Download the installation package again.