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How do you change the size of ImageView?

O
obi last edited by
There are several ImageView and Button on the fragment. In the Button click, ImageView is required to change the dimensions. The whole RelativeLayout.
I'm trying to achieve the result by:
```
int width = myImageView.getWidth() + 100;
int height = myImageView.getHeight() + 100;
myImageView.setLayoutParams(new RelativeLayout.LayoutParams(width, height));
```
In the Button click, ImageView's successfully increased. There are no results for repeat clicks, i.e. ImageView dimensions are no longer changing. Which way?
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1 Reply Last reply

guilherme

Try this:

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) myImageView.getLayoutParams();
params.width += 100;
params.height += 100;
myImageView.setLayoutParams(params);

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After you raised the story. DATEBASE_VERSION, when accessing the OBD system, the method onUpgrade(...)which deleted the existing table:db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACT_FRUIT); That's why you're getting an exception. You're trying to add a recording to a table that doesn't exist.Once the table is removed, it needs to be created. Method code onUpgrade(...) It will be like this:@Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACT_FRUIT); db.execSQL(CREATE_TABLE_FRUIT); }
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You can define the device, for example, by using navigator.userAgent or dpr window.devicePixelRatio♪ Then, depending on the type of device, display the appropriate size of the mark.
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Here is the opproximation using some transformation and perspective (without transparency) .box { width: 200px; height: 100px; margin: 20px; position: relative; border: 20px solid red; border-width: 20px 3px 20px 20px; border-radius:55px; transform:perspective(112px) rotateY(5deg); z-index: 1; } .box:before { content: ""; position: absolute; top: -5px; left: -5px; right: 35px; bottom: -5px; background: #fff; z-index: -1; border-radius: 40px; transform: perspective(112px) rotateY(-7deg); transform-origin: left; }<div class="box"> </div>This can be achieved, both with pseudoelement and with the contents inside: .box { width: 200px; height: 100px; margin: 20px; position: relative; z-index: 0; box-sizing: border-box; padding: 40px; } .box:before { content: ""; position: absolute; top: 0; left: 0; right: 0; bottom: 0; border: 20px solid red; border-width: 20px 3px 20px 20px; border-radius: 55px; transform: perspective(112px) rotateY(5deg); z-index: -1; } .box:after { content: ""; position: absolute; top: 10%; left: 5%; right: 19%; bottom: 10%; background: #fff; z-index: 1; border-radius: 36px; transform: perspective(112px) rotateY(-7deg); transform-origin: left; z-index: -1; }<div class="box"> some text </div>Here is another idea with a complex background cover with transparency and improved response control: .box { max-width:200px; margin:10px; position:relative; padding:30px 20px; z-index:0; box-sizing:border-box; display:inline-block; } .box:before { content:""; position:absolute; z-index:-1; top:0; left:0; right:0; bottom:0; border:2px solid red; border-radius:40px; background: /gradient position/size/ radial-gradient(circle at bottom right,transparent 23px,red 25px) top left/34px 32px, radial-gradient(circle at top right ,transparent 23px,red 25px) bottom left/34px 32px, linear-gradient(red,red) left/10px 100%, linear-gradient(to top left ,transparent 45%,red 50%) top left /85% 10px, linear-gradient(to bottom left,transparent 45%,red 50%) bottom left/85% 10px; background-repeat:no-repeat; transform:perspective(100px) rotateY(5deg); } body { background:pink; }<div class="box"> some text some text some text some text some text </div> <div class="box"> some text some text </div> <div class="box"> some text text </div> <div class="box"> some text some text some text </div>To better understand the colour, change the color of each gradient: .box { max-width:200px; margin:10px; position:relative; padding:30px 20px; z-index:0; box-sizing:border-box; display:inline-block; } .box:before { content:""; position:absolute; z-index:-1; top:0; left:0; right:0; bottom:0; border:2px solid red; border-radius:40px; background: radial-gradient(circle at bottom right,transparent 23px,rgba(200,0,0,0.6) 25px) top left/34px 32px, radial-gradient(circle at top right ,transparent 23px,rgba(200,0,0,0.6) 25px) bottom left/34px 32px, linear-gradient(yellow,yellow) left/10px 100%, linear-gradient(to top left ,white 45%,green 50%) top left /85% 10px, linear-gradient(to bottom left,white 45%,black 50%) bottom left/85% 10px; background-repeat:no-repeat; transform:perspective(100px) rotateY(5deg); } body { background:pink; }<div class="box"> some text some text some text some text some text </div>
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Answer:Adaptation for different resolutions /questions/tagged/android consists of: Values relative to one LinearLayout that would be the Weights(android:layout_weight).Explanation:You can assign the property android:layout_weight in its XML elements, which would be like a weight(well to say percentage) that is distributed according to the value of this property in all the elements that are relative to its LinearLayout, would be a sum of all Weight's which are declared in Elementos inside your LinearLayout that alone has one WeightSum which is a property that says the maximum value(100%) allowed to their children. By default the value of WeightSum It is 1.The property in se WeightSum which is the total weight pattern of LinearLayout would be android:weightSum=x where x would be the weight value (which can be decimal).The property in se Layout Weight that is the weight value of a child element of LinearLayout would be android:layout_weight=x where x would be the weight value (which can be decimal).Example:<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingLeft="16dp" android:paddingRight="16dp" android:weightSum="1"  android:orientation="vertical" > <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="@string/to" /> <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:hint="@string/subject" /> <EditText android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1"  android:gravity="top" android:hint="@string/message" /> <Button android:layout_width="100dp" android:layout_height="wrap_content" android:layout_gravity="right" android:text="@string/send" /> </LinearLayout> Result:Observations:No EditText of the Message you have no values in dp absolutes for height(height), you only have android:layout_weight="1" that would be the weight of such an element.If you look at all the children elements of LinearLayout, will realize that the only element containing weight(weight) would be the EditText of the Message, therefore the sum of all weights would be 1. But if there was another element 1 of weight also, the total weight would be 2 and would exceed the standard limit of WeightSum the LinearLayout that would be 1.But if you have one WeightSum of 10, for example, you could have 10 child elements containing android:layout_weight=1 each, being so each element would have 10% the total size.Very important note:You may be wondering: Okay, but where do I inform you if the weight is for height or width??The answer is: This is strictly linked to Orientation of your LinearLayout that would be this property:android:orientation="vertical" From which you may notice that you are declared in LinearLayout for example above, but if he were horizontal weight's would be applied horizontally only. http://developer.android.com/guide/topics/ui/layout/linear.html#Weight
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I see at least two possible alternatives, but there must be more. The first of these is the simplest, but also more fragile, and consists of freezing the set of existing class fields (as well as freezing the serialVersionUID) and force new fields to be added with the modifier transient. Any violation of this rule will cause the problem you describe.The other alternative is to take control of serialization yourself by implementing the following methods:private void writeObject(java.io.ObjectOutputStream out) throws IOException; private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException; private void readObjectNoData() throws ObjectStreamException; These methods are described in the interface documentation https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html . Basically, they replace the standard serialization form and allow you to define your own particular form of serialization. The method writeObject is responsible for serializing the object and readObject for deserializing. The method readObjectNoData decides what to do when the object to be created comes from one stream stream stream stream stream stream corrupted or incompatible.O ObjectOutputStream is the object responsible for serializing the object and he knows the object being serialized. This way if you use the methods https://docs.oracle.com/javase/8/docs/api/java/io/ObjectOutputStream.html#defaultWriteObject-- and https://docs.oracle.com/javase/8/docs/api/java/io/ObjectInputStream.html#defaultReadObject-- , the non-transient of the object in question will be serialized and deserialized respectively in the standard way the java does. Therefore, you can use these methods to write and read the default fields and use the other methods in the same stream stream stream stream stream stream to write and read the values of the other fields that will be marked as transient. Or else you do not use these methods and add/understand the values of the object fields manually when using the other methods of stream stream stream stream stream stream.In addition, you may also prefer to implement the interface https://docs.oracle.com/javase/8/docs/api/java/io/Externalizable.html to have better control over stream stream stream stream stream stream.
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How do you change the size of ImageView?

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