Android之dialog实现底部出现对话框

首先 是自己定义的MyDialog

public class MyDialog extends Dialog {

Activity context;
View view;
/*对话框宽度
* 宽度适应中间对话框宽度 为屏幕1/3
* 为2 适应底部对话框 宽度为屏幕宽度
*/
int gravityMode;

public MyDialog(Activity context,View view,int gravityMode) {
super(context);
this.context = context;
this.view = view;
this.gravityMode = gravityMode;
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setBackgroundDrawableResource(R.color.bantouming_color);
/*view = View.inflate(this.context, R.layout.dialog_user_headimg, null);*/
setContentView(view);
initDialogSize();
}
private void initDialogSize(){
WindowManager m = context.getWindowManager();
Display d = m.getDefaultDisplay();
WindowManager.LayoutParams p = getWindow().getAttributes();  //获取对话框当前的参数值

if (gravityMode == 1){
p.height = (int) (d.getHeight() * 0.25);   //高度设置为屏幕的0.35
p.width = (int) (d.getWidth() * 0.7);    //宽度设置为屏幕的0.7
}else if (gravityMode == 2){
p.height = (int) (d.getHeight() * 0.3);   //高度设置为屏幕的0.35
p.width = (int) (d.getWidth() * 0.9);    //宽度设置为屏幕的0.7
}
getWindow().setAttributes(p);     //设置生效
}
}

然后就是在相应的地方，运用

若需求是在屏幕中间弹出对话框，则直接调用即可

MyDialog mDialog;

View view  = View.inflate(this,R.layout.***,null);

mDialog = new MyDialog(this,view，1);

mDialog.show();

如果需求是在底部弹出对话框，例如设置头像时候，在底部弹出对话框，让用户选择，相机拍照、相册选择或取消 

这时候只需像上面调用MyDialog之后，将

mDialog  = new MyDialog(thgis,view,2); 

并添加代码一句：

Window mWindow = mDialog.getWindow();
mWindow.setGravity(Gravity.BOTTOM | Gravity.BOTTOM);

 即可！