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android常见技巧的使用

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android 常见方法技巧的使用

LinearLayout 设置边框

新建一个shape的xml

image-20220505230711328

image-20220505230746449

点击ok，即可创建成功。

边框

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# 直线边框

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#FFFFFF" />

    <stroke
        android:width="1dp"
        android:color="#000000" />

    <padding
        android:bottom="0.1dp"
        android:left="0.5dp"
        android:right="0.5dp"
        android:top="0dp" />
</shape>
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# 只有一条边的边框

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <!-- 连框颜色值 -->
    <item>
        <shape>
            <solid android:color="#000000" />
        </shape>
    </item>
    <!-- 主体背景颜色值 -->
    <item android:bottom="1dp">   <!--设置只有底部有边框-->
        <shape>
            <solid android:color="#ffffff" />
        </shape>
    </item>
</layer-list>
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# 圆形边框

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="@color/white"/>
    <!--  圆角 <corners android:radius="15dp"/>-->
    <corners
        android:topRightRadius="15dp"
        android:bottomRightRadius="15dp"
        android:bottomLeftRadius="15dp"
        android:topLeftRadius="15dp"/>
    <stroke android:width="1dp" android:color="#DCDCDC"/>
</shape>

使用

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在 xml 中调用 android:background = "@drawable/设置边框的名字"  （不加xml）

Fragment下使用Intent

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TextView shezhi = (TextView) view.findViewById(R.id.shezhi);

// 点击设置，跳转到子界面
shezhi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent it = new Intent(getActivity(), Myinfoset.class);
// 需要使用 getActivity()方法
startActivity(it);
}
});

// 正常情况下
Intent it = new Intent(MainActivity.this,MainActivity2.class);
it.putExtra("sendinfo",name);
it.putExtra("value",i);
startActivityForResult(it,1);

ImageView自定义为圆形

新建一个java class

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import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

import androidx.annotation.Nullable;

public class CircleImageView extends androidx.appcompat.widget.AppCompatImageView{

    //画笔
    private Paint mPaint;
    //圆形图片的半径
    private int mRadius;
    //图片的宿放比例
    private float mScale;

    public CircleImageView(Context context) {
        super(context);
    }

    public CircleImageView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public CircleImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //由于是圆形，宽高应保持一致
        int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
        mRadius = size / 2;
        setMeasuredDimension(size, size);
    }

    @SuppressLint("DrawAllocation")
    @Override
    protected void onDraw(Canvas canvas) {

        mPaint = new Paint();

        Drawable drawable = getDrawable();

        if (null != drawable) {
            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();

            //初始化BitmapShader，传入bitmap对象
            BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
            //计算缩放比例
            mScale = (mRadius * 2.0f) / Math.min(bitmap.getHeight(), bitmap.getWidth());

            Matrix matrix = new Matrix();
            matrix.setScale(mScale, mScale);
            bitmapShader.setLocalMatrix(matrix);
            mPaint.setShader(bitmapShader);
            //画圆形，指定好坐标，半径，画笔
            canvas.drawCircle(mRadius, mRadius, mRadius, mPaint);
        } else {
            super.onDraw(canvas);
        }
    }

}

在xml中使用

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<com.henu.eltfood.CircleImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="10dp"
    android:src="@drawable/firname" />

将按钮固定在最下面

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<LinearLayout
        android:gravity="bottom|center"
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:layout_weight="1"
        android:layout_height="0dp">

    <Button
        android:text="退出登录"
        android:minWidth="150dp"
        android:layout_marginBottom="10dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

TextView设置点击事件

和正常的button的点击事件一样，将TextView里面添加一下 android:clickable="true"