Android控件-Toolbar控件使用

1.布局文件

<androidx.appcompat.widget.Toolbar
            android:id="@+id/title_tool_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorPrimary"
          >

2.初始化 Toolbar

private void initToolbar(){
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
        toolbar.setNavigationIcon(ContextCompat.getDrawable(this, R.drawable.toolbar_back));
        toolbar.setOverflowIcon(ContextCompat.getDrawable(this, R.drawable.toolbar_more));
        setTitle("标题demo");
    }

3.更多按钮

（1） 更多按钮设置 （res/menu文件下）

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.example.toolbar.MainActivity">
    <item android:title="Item" />
    <item android:title="Item" />
    <item
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:title="@string/action_settings"
        app:showAsAction="never" />
</menu>

（2） 更多按钮的监听代码

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
         Toast.makeText(this,"进入设置功能",Toast.LENGTH_SHORT).show();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }