页面启动的时候对页面中View做拦截和替换

Love The Way You Lie 2022-10-01 08:46 50阅读 0赞

[AppCompatActivity怎么对View做的拦截][AppCompatActivity_View]中分析了AppCompatActivity是怎么对View做拦截的。只需要在`setContentView`方法之前设置下factory就可以了

public class MainActivity extends Activity {
        @ViewById(R.id.textView)
        TextView mTextView;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            ViewUtils.inject(this);
            LayoutInflater layoutInflater = LayoutInflater.from(this);
            LayoutInflaterCompat.setFactory2(layoutInflater, new LayoutInflater.Factory2() {
                @Override
                public View onCreateView(View parent, String name, Context context, AttributeSet attrs) {
                    if ("TextView".equals(name)){
                        Button button=new Button(MainActivity.this);
                        button.setText("button");
                        return button;
                    }
                    return null;
                }
    
                @Override
                public View onCreateView(String name, Context context, AttributeSet attrs) {
                    return null;
                }
            });
            setContentView(R.layout.activity_main);
    }
    复制代码

将页面内的`TextView`控件替换为Button。

> 设置factory-->setContentView(内部执行LayoutInflater.inflate-->有设置factory回调factory的onCreateView方法)-->回调LayoutInflaterCompat.setFactory2中重写的onCreateView方法,完成View拦截和替换

**运行截图**

转载于:https://juejin.im/post/5cb6e9f4f265da035d0c7346

[AppCompatActivity_View]: https://juejin.im/post/5cadeacc6fb9a068b16e09a2